CR4® - The Engineer's Place for News and Discussion®


Previous in Forum: Cell Phone Left Unattended/Uncharged for Three Years  
Close
Close
Close
54 comments
Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Marine Engineering - New Member

Join Date: Sep 2008
Location: Vancleave, Ms about 30 miles inland from Biloxi and the coast
Posts: 3111
Good Answers: 104

High Fidelity Equipment

01/07/2018 3:16 PM

Many years ago, maybe 55-60 years, I used to attend high fidelity audio shows which were held at the New Yorker hotel in Manhattan. There were vendors from all over the world displaying and demonstrating all of their equipment. Many of the demonstrations were LOUD, but exciting all the same. I had attended for only 3 years, as I had to leave the NYC area for job concerns. While I attended, vendors were displaying cutting edge audio equipment that at the time was revolutionary, at least to me. There was a turntable that could play in any position, even upside down and under water to boot. It wasn't actually water, but a liquid that was inert and didn't conduct current. I saw a tape deck that had magnetic drag cups for the take-up reels and much more I cannot remember. I looked forward to those shows every year.

My question now is; what happened to all the equipment that was shown at the shows over the years? The manufacturers are now long gone, but I wonder what was the disposition of their equipment. I have searched Hi Fi sites trying to locate some of this equipment, but there doesn't seem to be any trace. There must be some of it sitting in someone's listening room or maybe in a box in the attic. Is there a museum where some of this equipment might have ended up?

I understand the original audio shows have been replaced by the Consumer Electronics Show (CES) being held in Las Vegas for 2018. It is nothing like the original, as it's focus is now on home theatre, artificial intelligence, driverless cars and less on audio.

__________________
Mr.Ron from South Ms.
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 19752
Good Answers: 1153
#1

Re: High Fidelity Equipment

01/07/2018 5:06 PM

Your search request is a little too generic to yield any results....but I would say if it's not for sale on Ebay then it probably wasn't produced in any quantity, then it would be anybody's guess....It is also a possibility that these have found a home in some audiophiles den and is a prized possession that might never see the light of day again...The higher end sets now go into the $millions...

__________________
Life is like riding a bicycle. To keep your balance you must keep moving. A.E.
Register to Reply
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 19752
Good Answers: 1153
#2
In reply to #1

Re: High Fidelity Equipment

01/07/2018 5:29 PM

__________________
Life is like riding a bicycle. To keep your balance you must keep moving. A.E.
Register to Reply
Guru

Join Date: Oct 2014
Location: Hemet, Land of milk and honey.
Posts: 1360
Good Answers: 23
#12
In reply to #2

Re: High Fidelity Equipment

01/08/2018 9:58 AM

Not sure how a 1963 invention fits in with a display of 1957 audio equipment.

Register to Reply Score 1 for Off Topic
Guru

Join Date: Oct 2014
Location: Hemet, Land of milk and honey.
Posts: 1360
Good Answers: 23
#36
In reply to #12

Re: High Fidelity Equipment

01/09/2018 6:08 PM

Lava lamp sitting on top of 3 drawer cabinet in lower left of image ( stereo system 1957 / Lava lamp 1963 ) .

Does anyone wonder if everything displayed is circa 1957 ?

Register to Reply Score 1 for Off Topic
Guru
Popular Science - Weaponology - New Member Fans of Old Computers - PDP 11 - New Member Technical Fields - Architecture - New Member Hobbies - HAM Radio - New Member

Join Date: Oct 2009
Location: Maine, USA
Posts: 2156
Good Answers: 69
#3

Re: High Fidelity Equipment

01/07/2018 7:08 PM

In my barn somewhere....

__________________
Tom - "Hoping my ship will come in before the dock rots!"
Register to Reply
Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Marine Engineering - New Member

Join Date: Sep 2008
Location: Vancleave, Ms about 30 miles inland from Biloxi and the coast
Posts: 3111
Good Answers: 104
#40
In reply to #3

Re: High Fidelity Equipment

01/09/2018 10:32 PM

I have that same Teac recorder and I think it is time to drag it out of storage. It went into storage when CD's came on the scene. I heard that tape decks are now the last word in sound reproduction as 15 ips is the key, it being the speed used for recording master tapes. Some companies are now releasing pre-recorded tapes at 15 ips. They cost around $80 each, but promise to be as good as it can get. I will be looking into upgrading my Teac to 15 ips (if possible) and making modifications if needed. I was looking at an old Allied Radio catalog from 1962 and they had Macintosh stereo 150W amps selling for $444. They now cost 4 figures, used. I had the old Dynaco stereo 70 amp back in 1962 that sold for $99.95. After I sold it, I read an article in one of the hi fi magazines that they took the Dynaco 70, clipped a couple of wires, added a capacitor and made it perform on a par with high end amplifiers costing 10 times more. Those old Dynaco's now go for close to $1000 used. Solid state equipment made me do it. I could kick myself.

__________________
Mr.Ron from South Ms.
Register to Reply
3
Guru

Join Date: Oct 2008
Posts: 40263
Good Answers: 1594
#4

Re: High Fidelity Equipment

01/07/2018 8:02 PM

Most of that equipment went into the garbage years ago.

It's now coming back into vogue for the same reason that old guys pay $40K for a Harley.

It isn't better, it's just because we now want to relive our youth and can afford to do it.

Register to Reply Good Answer (Score 3)
Guru

Join Date: Oct 2014
Location: Hemet, Land of milk and honey.
Posts: 1360
Good Answers: 23
#13
In reply to #4

Re: High Fidelity Equipment

01/08/2018 10:02 AM

Most logical / reasonable answer.

Register to Reply
Guru

Join Date: Apr 2010
Posts: 5909
Good Answers: 602
#5

Re: High Fidelity Equipment

01/07/2018 8:49 PM
Register to Reply
Guru
Hobbies - CNC - New Member Hobbies - DIY Welding - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Aug 2007
Posts: 19318
Good Answers: 346
#6

Re: High Fidelity Equipment

01/07/2018 8:53 PM

I don’t recall if it was in popular mechanics or popular electronics... don’t even remember when, probably was about 20-30 years ago... that tubes had a lot mellower sounds (analog instead of digital)

__________________
phoenix911
Register to Reply
3
Guru

Join Date: Apr 2010
Posts: 5909
Good Answers: 602
#7
In reply to #6

Re: High Fidelity Equipment

01/07/2018 10:38 PM

Actually, both tube and transistor amplifiers are analog.

There are a number of factors that affect the difference in sound between transistor amplifiers and tube amplifiers, and a lot of the difference is subjective.

Bipolar transistors are of two types, NPN and PNP, and are used complementarily in amplifiers (class AB) whereas tubes are of only one type and must work against a load resistor (class A). Even orders of harmonic distortion cancel out in a class AB amplifier whereas all orders of distortion are present in a class A amplifier.

But an AB amplifier may have some crossover distortion where one transistor stops conducting when the other starts. And crossover distortion can be most objectionable in quiet periods in music.

So the distortion is different in tube amplifiers than in transistor amplifiers and may be perceived as "more pleasant".

AMPLIFIER CLASSES

Class A: (transistor shown)

Class AB

https://en.wikipedia.org/wiki/Power_amplifier_classes

Amplifier class is just one factor. There are also other factors such as impedance, soft clipping and lower bandwidth of tube amplifiers, etc, that also contribute to the "tube sound".

You can find more than you probably ever wanted to know in:

https://en.wikipedia.org/wiki/Tube_sound

Register to Reply Good Answer (Score 3)
Guru
Hobbies - CNC - New Member Hobbies - DIY Welding - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Aug 2007
Posts: 19318
Good Answers: 346
#9
In reply to #7

Re: High Fidelity Equipment

01/08/2018 7:11 AM

Thanks Rixter,... nice informative response.

How it was explained and how I understood the reasoning ... is that the digital output is more like this (step)... (Forgive the crudeness) Where the analog is smoothed wave patterned like your diagram.

Digital

__________________
phoenix911
Register to Reply
Guru

Join Date: Apr 2010
Posts: 5909
Good Answers: 602
#14
In reply to #9

Re: High Fidelity Equipment

01/08/2018 10:24 AM

OK, I see where you're coming from, a digital amplifier, which is just an A/D converter connected to a high power D/A converter. I think they use low-passed, high-frequency pulse width modulation to generate the analog output, and like a switching power supply, the controlling element being either on or off, not halfway, wastes little power. It's interesting that some have feedback circuitry that detects and corrects for any distortion in the output waveform.

Here is an interesting article:

https://www.axiomaudio.com/blog/digital_amplifier

Register to Reply
Guru
Hobbies - CNC - New Member Hobbies - DIY Welding - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Aug 2007
Posts: 19318
Good Answers: 346
#15
In reply to #14

Re: High Fidelity Equipment

01/08/2018 10:44 AM

the controlling element being either on or off, not halfway, wastes little power.

Correct, a discrete output... On or Off

The info I had was like from 20-30 years ago... I can definitely understand that technology solved the issue since then...

__________________
phoenix911
Register to Reply
Guru
Engineering Fields - Instrumentation Engineering - EE from the the Wilds of Pa.

Join Date: Feb 2006
Location: middle of nowhere, Pennsylvania
Posts: 2531
Good Answers: 60
#18
In reply to #9

Re: High Fidelity Equipment

01/08/2018 5:04 PM

And true audiophiles claim to be able to hear that. The tube amplifier is described as "warmer" sounding, whatever that means. I've listened on both types of amplifiers playing through some $10K speakers (in 1985) in a high end audio store listening room and couldn't hear the difference. But then again, I have some twisted ears. I have very small canals and ear drums and thus am biased to the high end of the spectrum and have a deep valley around 3K Hz. That might just make a difference.

__________________
Remember when reading my post: (-1)^½ m (2)^½
Register to Reply
Power-User

Join Date: Apr 2017
Location: Southern Illinois
Posts: 223
Good Answers: 5
#20
In reply to #18

Re: High Fidelity Equipment

01/08/2018 10:20 PM

One source of confusion in this area, is that the whole process, from the actual instruments played to the listener's ears, has to be of high quality to notice any difference. Any one component in the whole chain affects the quality of the end product. A poorly recorded sample will not be improved by high-end play-back equipment. So many parts, are beyond the control of any one person. What is within that one person's control, usually cannot bring out the full potential of what could be. That would take a whole comprehensive approach, from the musicians to the listener. That kind of collaboration usually never happens. What does usually happen is the typical "wack-a-mole" approach to individual components, which usually results in "failed" experiments that people give up on, because it doesn't seem to matter.

__________________
Science is the "cookbook" for making things.
Register to Reply
Guru
Engineering Fields - Instrumentation Engineering - EE from the the Wilds of Pa.

Join Date: Feb 2006
Location: middle of nowhere, Pennsylvania
Posts: 2531
Good Answers: 60
#34
In reply to #20

Re: High Fidelity Equipment

01/09/2018 4:09 PM

You eliminated me in the first sentence - I have some weird ears, hardly high quality, unless you have a recording of a piece with little content in the bass and mid range. I am one of those people, who, while still young, was very annoyed by sonic motion detectors. I could hear well over 20K Hz at one time. However, I have always had poor detection in the mid ranges. That is not a by product of aging. Hearing exam professionals try to lay the blame on the workplace, but it was an issue well before I started working. More likely the numerous inner ear infections I had from the age of 3 to 8 is to blame.

Now, the recorded material was not an issue in the demo I was talking about, as, ALL high end audio dealers are sure to have the very best of recordings. I used to bring my own recorded material that I was familiar with just to eliminate that bias, when actually seeking to purchase audio equipment.

__________________
Remember when reading my post: (-1)^½ m (2)^½
Register to Reply
Guru

Join Date: Oct 2009
Posts: 1243
Good Answers: 23
#10
In reply to #7

Re: High Fidelity Equipment

01/08/2018 8:41 AM

There are yet more classes of amplifier, with class D being a switching amplifier which can be used for audio. I have not heard of a class D valve (tube) amplifier, though.

Register to Reply
Power-User

Join Date: Oct 2012
Location: Wherever my motorcycle has taken me!
Posts: 224
Good Answers: 13
#11
In reply to #6

Re: High Fidelity Equipment

01/08/2018 9:47 AM

You may find the "Amplifier Modeling" section of interest.

__________________
Common sense is an oxymoron and the world is full of morons. (I am not one of them)!!!
Register to Reply
Guru
Safety - Hazmat - New Member United States - US - Statue of Liberty - New Member Engineering Fields - Chemical Engineering - Old Hand

Join Date: Mar 2011
Location: Lubbock, Texas
Posts: 14222
Good Answers: 156
#33
In reply to #6

Re: High Fidelity Equipment

01/09/2018 1:51 PM

There is little remembered thing about cross-over distortion, however, I think CMOS has done away with that, or other techniques that use DC summation to get a pure sine wave without the little glitchy-poo near zero point six Volts.

__________________
If it ain't broke, don't fix it. Just build a better one.
Register to Reply
Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Marine Engineering - New Member

Join Date: Sep 2008
Location: Vancleave, Ms about 30 miles inland from Biloxi and the coast
Posts: 3111
Good Answers: 104
#41
In reply to #33

Re: High Fidelity Equipment

01/09/2018 10:42 PM

Are you familiar with the tape recorder museum in Austin, Texas? This link is part 1 of 3 of that museum. Very interesting.

https://www.youtube.com/watch?v=iOyYsg7fcvE

__________________
Mr.Ron from South Ms.
Register to Reply
Guru
Australia - Member - New Member

Join Date: Feb 2008
Location: Australia
Posts: 1768
Good Answers: 207
#8

Re: High Fidelity Equipment

01/08/2018 5:20 AM

I once "inherited" the B&W set from a local TV channel 15 years after colour was implemented. 6 x 5' high 18" racks of wonderful gear. My thesis was on a 16 bit A/D converter for analogue video signal. No single chip available, had to use a cascade op-amp string to create digital signal.

Salvaged a few pieces for my Beckman 8 track reel to reel system ( 1 x 5' high 18") rack and sold the rest for parts and scrap.

The Beckman is now also gone the way of the dinosaurs. It was used as an analogue computer for ECG , heart rate and blood pressure analysis and the professor wanted to retain the analogue system in those early days of digital. Everything was on 8 track tapes so that results could be re-created on chart recorder through the replay options.

Interesting "calibration" using the 8 track and 8 speakers in the room corners. Eyes closed, headphones on, listening to "snoopy and the red baron" dog fight. If balance correctly set, snoopy would fly through the middle of your eyes at the end. There was also a steam train option, but not so nearly interesting.

__________________
Just an Engineer from the land down under.
Register to Reply
Guru

Join Date: Jul 2006
Location: CA (Central Arkansas, USA)
Posts: 553
Good Answers: 9
#16
In reply to #8

Re: High Fidelity Equipment

01/08/2018 1:40 PM

There were a lot of steam engines, those new fangled jet air planes and other stuff going through living rooms in the early days of stereo!

__________________
If it's too good to be true, it probably isn't
Register to Reply
Guru
Australia - Member - New Member

Join Date: Feb 2008
Location: Australia
Posts: 1768
Good Answers: 207
#50
In reply to #16

Re: High Fidelity Equipment

01/16/2018 4:07 AM

Stereo was good, but I had play for all 8 tracks simultaneously, with speakers in all 8 corners of the room. (Ceiling and floor)

I was also playing around with 5kW amplifiers at the time. Stage amplifiers for some guitarists in a rock band. Three of them. Was the beginning of extruded aluminium for heatsinks and we still stood them in water. They used to make "fog" after the first song and we usually had to replace multiple transistors between gigs.

I had to leave for other reasons, but his parting question was "Could we make a 10kW amp for the lead guitar?"

__________________
Just an Engineer from the land down under.
Register to Reply
Guru
Hobbies - Musician - Engineering Fields - Chemical Engineering - New Member Engineering Fields - Control Engineering - New Member Engineering Fields - Instrumentation Engineering - New Member

Join Date: Jan 2007
Location: Moses Lake, WA, USA, Thulcandra - The Silent Planet (C.S. Lewis)
Posts: 4035
Good Answers: 180
#52
In reply to #50

Re: High Fidelity Equipment

01/16/2018 3:42 PM

Are there single speakers that will handle that magnitude of power, or do you network lots and lots of "regular" instrument speakers?

__________________
"Reason is not automatic. Those who deny it cannot be conquered by it. Do not count on them. Leave them alone." - Ayn Rand
Register to Reply
Guru
Australia - Member - New Member

Join Date: Feb 2008
Location: Australia
Posts: 1768
Good Answers: 207
#53
In reply to #52

Re: High Fidelity Equipment

01/17/2018 6:05 AM

I was only helping build and maintain the amps, but I think they went to multiple speakers. I never went to their shows and do not know whether they had impedance matching and all those other necessary features for power transfer. This was back in the '80's

I have handled some 2kW rms individual speakers since then, but they weighed nearly one Ton each (ballast added) so that the armature movement was "real" and so that they didn't dance around the place. These had travel limit sensors, alignment sensors and other protection for mechanical damage. Armature travel was limited to around +/-40mm. Significant hearing protection required anywhere near them during frequency sweep testing at low power. Exclusion zones enforced when in operation.

From memory, upper frequency was around 5kHz. Sweep tests were done in sinusoidal mode and we could control down to 0.1Hz where you could see the armature moving, but hear nothing. Controller was smart enough to change from frequency to displacement limits to protect hardware.

These were purchased around 1995 from Ireland/UK and cost around USD60k each at the time. They were never used for public entertainment or general audio. We needed the "sound" for a testing laboratory. They were also mounted so that the armature end was in an environmental chamber capable of -40DegC to 80 DegC.

__________________
Just an Engineer from the land down under.
Register to Reply
Guru
Safety - Hazmat - New Member United States - US - Statue of Liberty - New Member Engineering Fields - Chemical Engineering - Old Hand

Join Date: Mar 2011
Location: Lubbock, Texas
Posts: 14222
Good Answers: 156
#54
In reply to #53

Re: High Fidelity Equipment

01/17/2018 9:46 AM

If one does not impedance match amp output to speaker input impedance, odd distortions usually result, not that I could hear the distinction, but others clearly can.

Not only this, the decibel level produced is not maximum in those circumstances.

__________________
If it ain't broke, don't fix it. Just build a better one.
Register to Reply
Guru

Join Date: Jul 2006
Location: CA (Central Arkansas, USA)
Posts: 553
Good Answers: 9
#17

Re: High Fidelity Equipment

01/08/2018 1:43 PM

Might find some things of interest in the Klipsch Museum of Audio History in Hope, Arkansas.

__________________
If it's too good to be true, it probably isn't
Register to Reply
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 19752
Good Answers: 1153
#19

Re: High Fidelity Equipment

01/08/2018 7:22 PM
__________________
Life is like riding a bicycle. To keep your balance you must keep moving. A.E.
Register to Reply
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 19752
Good Answers: 1153
#21
In reply to #19

Re: High Fidelity Equipment

01/08/2018 10:21 PM

__________________
Life is like riding a bicycle. To keep your balance you must keep moving. A.E.
Register to Reply
Guru
Hobbies - CNC - New Member Hobbies - DIY Welding - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Aug 2007
Posts: 19318
Good Answers: 346
#23
In reply to #21

Re: High Fidelity Equipment

01/09/2018 10:00 AM

About 25 years ago,.. I just bought a stereo. I was at a party, and the topic came up and I mentioned that I just purchased a stereo.

One of the party goer... ears perked up and grilled me...

Party Goer: "Is it a Stereo, or a HiFi"

Me: "how the hell should I know?"

Party goer then went in a conversation that resembled a lecture that seemed to last forever on the differences, and that most don't know the difference.

__________________
phoenix911
Register to Reply
Guru

Join Date: Oct 2008
Posts: 40263
Good Answers: 1594
#25
In reply to #23

Re: High Fidelity Equipment

01/09/2018 10:11 AM

Stereos are good for listening to sound effects records/tapes/CDs, with headphones especially.

In a noisy room, who could tell anyway.

Register to Reply
Guru
Hobbies - CNC - New Member Hobbies - DIY Welding - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Aug 2007
Posts: 19318
Good Answers: 346
#26
In reply to #25

Re: High Fidelity Equipment

01/09/2018 10:19 AM

I had it hooked up to my TV... the first movie I watched with it was 'Predator'...

I liked it....

__________________
phoenix911
Register to Reply
Guru

Join Date: Oct 2008
Posts: 40263
Good Answers: 1594
#27
In reply to #26

Re: High Fidelity Equipment

01/09/2018 10:32 AM

We bought a surround sound system when they first came out and watched Jurassic Park. That was awesome. I can't hear well enough any more to bother with it and I think we gave it to one of our kids.

Register to Reply
Guru
Hobbies - CNC - New Member Hobbies - DIY Welding - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Aug 2007
Posts: 19318
Good Answers: 346
#28
In reply to #27

Re: High Fidelity Equipment

01/09/2018 10:56 AM

That would be a good movie also... when you look to see what the rustling noise is behind you... lol

__________________
phoenix911
Register to Reply
Guru
Safety - Hazmat - New Member United States - US - Statue of Liberty - New Member Engineering Fields - Chemical Engineering - Old Hand

Join Date: Mar 2011
Location: Lubbock, Texas
Posts: 14222
Good Answers: 156
#30
In reply to #23

Re: High Fidelity Equipment

01/09/2018 11:17 AM

They really asked that right after you told them directly that you bought a stereo.

If I bought an Oreo cookie, would some ask if it was Chips Ahoy?

The answer: "It is uh...a stereo". Then walk away.

__________________
If it ain't broke, don't fix it. Just build a better one.
Register to Reply
Guru
Hobbies - CNC - New Member Hobbies - DIY Welding - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Aug 2007
Posts: 19318
Good Answers: 346
#31
In reply to #30

Re: High Fidelity Equipment

01/09/2018 11:25 AM

Or... Yes,.. it has AM and everything... then walk away.

Actually, it was a party,... I attract boring people,... that why I get invited so others can have fun.

The host came up to me afterwards and said, I can't believe he's so into it, ... I guess a few people were listening... She did ask why I didn't walk away...

My answer was two reasons... One he was on the border of actually saying something that could be interesting... but that never happened. The second reason... that would be rude... and one rude person at the party is more then enough....

__________________
phoenix911
Register to Reply Score 1 for Good Answer
Guru
Safety - Hazmat - New Member United States - US - Statue of Liberty - New Member Engineering Fields - Chemical Engineering - Old Hand

Join Date: Mar 2011
Location: Lubbock, Texas
Posts: 14222
Good Answers: 156
#32
In reply to #31

Re: High Fidelity Equipment

01/09/2018 11:37 AM

I have not been to a party in years. I rest your case.

__________________
If it ain't broke, don't fix it. Just build a better one.
Register to Reply
Guru

Join Date: Apr 2010
Posts: 5909
Good Answers: 602
#39
In reply to #31

Re: High Fidelity Equipment

01/09/2018 9:28 PM

Yeah, parties. I don't go to parties anymore. The last one I went to, people were standing around in little groups, drinking and talking. I was the only one in my group...

Register to Reply
Guru
Hobbies - CNC - New Member Hobbies - DIY Welding - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Aug 2007
Posts: 19318
Good Answers: 346
#42
In reply to #39

Re: High Fidelity Equipment

01/10/2018 7:07 AM

The I'm the same way.... and the secret to my success is,... I like to surround myself with all my friends.... Hey,.... where'd everybody go?

__________________
phoenix911
Register to Reply
2
Power-User

Join Date: Apr 2017
Location: Southern Illinois
Posts: 223
Good Answers: 5
#37
In reply to #23

Re: High Fidelity Equipment

01/09/2018 6:10 PM

"Is it a Stereo, or a HiFi"? That's like seeing a car and asking, "Is that an automatic, or a V8?". High-Fidelity means that it record/play-back with high quality frequency/volume response. Stereo just means that it has two separate channels. Even if it does have two separate channels (stereo), those channels can be only low-fidelity quality. They're two separate issues. That party goer didn't know what he was asking. If you ask the wrong question, you're 100% guaranteed to get the wrong answer.

__________________
Science is the "cookbook" for making things.
Register to Reply Good Answer (Score 2)
Guru
Safety - Hazmat - New Member United States - US - Statue of Liberty - New Member Engineering Fields - Chemical Engineering - Old Hand

Join Date: Mar 2011
Location: Lubbock, Texas
Posts: 14222
Good Answers: 156
#22

Re: High Fidelity Equipment

01/09/2018 9:20 AM

There is at least one Hi-Fidelity sound shop here in Lubbock, you should come up to the High Plains of Texas for a look and a listen.

Questions:

  1. If you totally remove dissolved mineral salts from water, the conductivity is about 0.055 μS/cm, resistivity is therefore 18.2 MΩ-cm, I don't think that would short out most phonograph equipment. Do you?
  2. I place a phonograph record spinning on its turntable under water (and the assumption is the turntable drive still has sufficient torque to maintain the proper 33.3 rpm for an LP album), and the needle is not connected to anything. Can you or I still hear the record being played, if we too are under the same water (swimming pool, or hot tub).
__________________
If it ain't broke, don't fix it. Just build a better one.
Register to Reply
Guru

Join Date: Oct 2008
Posts: 40263
Good Answers: 1594
#24
In reply to #22

Re: High Fidelity Equipment

01/09/2018 10:08 AM

Not sure who this is directed to, but that's never stopped me before.

1.The secret to "renewing" water soaked electronics is proper, complete drying.

I've driven RC model cars into the pool and after sitting in the sun for a day; good as new. Cell phones can sometimes be saved too. I dunked mine in a pan of IPA for a couple hours and set it out in the sun for two days. Except for some residue on the screen it worked for years after.

2. Yes, if you get close enough and disregard the damping effect of the tone arm in the water. The needle will still produce vibrations that you can hear. Depending on how much noise from the drive mechanism and, other sources, is damped out or ignored. (Disclaimer: I have not personally conducted this experiment, nor am I about to furnish and documentary evidence supporting my opinions. Not now, not ever)

Register to Reply
Guru
Safety - Hazmat - New Member United States - US - Statue of Liberty - New Member Engineering Fields - Chemical Engineering - Old Hand

Join Date: Mar 2011
Location: Lubbock, Texas
Posts: 14222
Good Answers: 156
#29
In reply to #24

Re: High Fidelity Equipment

01/09/2018 11:15 AM

1. nice trick - pure distilled water might be more effective.

2. LOL - I would not carry that one out either.

__________________
If it ain't broke, don't fix it. Just build a better one.
Register to Reply
Power-User

Join Date: Apr 2017
Location: Southern Illinois
Posts: 223
Good Answers: 5
#35
In reply to #24

Re: High Fidelity Equipment

01/09/2018 5:56 PM

Sound actually travels better in water. What seems as a damping effect, is that once in the water, sound has a hard time leaving it. It can't really go from water to air. If you're in the water with the sound, it's louder than if the sound is in the water and you're in the air (out of the water), and vice versa (if you're in the water, it seems to dampen sounds from the air). But, in water-to-water/air-to-air transmission, it travels better in water than in air.

__________________
Science is the "cookbook" for making things.
Register to Reply
Guru

Join Date: Oct 2008
Posts: 40263
Good Answers: 1594
#38
In reply to #35

Re: High Fidelity Equipment

01/09/2018 6:23 PM

True, mostly. It can travel from water to air but the transition is very muted because water doesn't vibrate as freely as air, relative density and all.

Register to Reply
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 19752
Good Answers: 1153
#43

Re: High Fidelity Equipment

01/10/2018 1:34 PM

__________________
Life is like riding a bicycle. To keep your balance you must keep moving. A.E.
Register to Reply
Guru
Hobbies - CNC - New Member Hobbies - DIY Welding - New Member Engineering Fields - Electromechanical Engineering - New Member

Join Date: Aug 2007
Posts: 19318
Good Answers: 346
#44
In reply to #43

Re: High Fidelity Equipment

01/10/2018 1:43 PM

That reminds me of the Bose Wave design from Bose

__________________
phoenix911
Register to Reply
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 19752
Good Answers: 1153
#47
In reply to #44

Re: High Fidelity Equipment

01/10/2018 8:15 PM

__________________
Life is like riding a bicycle. To keep your balance you must keep moving. A.E.
Register to Reply
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 19752
Good Answers: 1153
#45

Re: High Fidelity Equipment

01/10/2018 7:21 PM

__________________
Life is like riding a bicycle. To keep your balance you must keep moving. A.E.
Register to Reply
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 19752
Good Answers: 1153
#46

Re: High Fidelity Equipment

01/10/2018 7:58 PM

__________________
Life is like riding a bicycle. To keep your balance you must keep moving. A.E.
Register to Reply
Guru
Technical Fields - Technical Writing - New Member Engineering Fields - Marine Engineering - New Member

Join Date: Sep 2008
Location: Vancleave, Ms about 30 miles inland from Biloxi and the coast
Posts: 3111
Good Answers: 104
#48
In reply to #46

Re: High Fidelity Equipment

01/11/2018 8:33 PM

I have been following all the Hi Fi videos on you tube with much interest and envy. I understand the new high fidelity sound is 15 ips tape as used in mastering. There are releases of pre-recorded tape at 15 ips that cost around $80. There has been a resurgence of vintage tape machines to play the new tapes. I'm looking to update my 7-1/2 ips Teac to play 15 ips. I have had an interest in hi fi since the 1950's, but solid state drove me away.

__________________
Mr.Ron from South Ms.
Register to Reply
Guru
Australia - Member - New Member

Join Date: Feb 2008
Location: Australia
Posts: 1768
Good Answers: 207
#51
In reply to #48

Re: High Fidelity Equipment

01/16/2018 4:18 AM

Tongue in cheek, remembering some posts from long ago.

"Can I plug my 7.5ips US tape player (110V) into European power outlet (220V) and get it to play at 15ips?"

__________________
Just an Engineer from the land down under.
Register to Reply
Guru

Join Date: Mar 2007
Location: at the beach in Florida
Posts: 19752
Good Answers: 1153
#49

Re: High Fidelity Equipment

01/14/2018 8:14 PM

__________________
Life is like riding a bicycle. To keep your balance you must keep moving. A.E.
Register to Reply
Register to Reply 54 comments
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.

Comments rated to be Good Answers:

These comments received enough positive ratings to make them "good answers".

Comments rated to be "almost" Good Answers:

Check out these comments that don't yet have enough votes to be "official" good answers and, if you agree with them, rate them!
Copy to Clipboard

Users who posted comments:

Circuit Breaker (2); Dennis R. Levesque (3); James Stewart (6); Just an Engineer (4); lyn (5); Mikerho (1); phoenix911 (9); phph001 (1); Phys (2); Rixter (4); ronseto (3); SolarEagle (9); Tom_Consulting (1); tonyhemet (3); wmerryall (1)

Previous in Forum: Cell Phone Left Unattended/Uncharged for Three Years  

Advertisement