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High Fidelity

08/13/2010 11:49 AM

I am originally from the New York City area and can remember the high fidelity shows that were presented free to the public. They were usually staged at the New Yorker hotel in the 50's and 60's. They took up 4 floors. All kinds of equipment was demonstrated. A lot of it is now considered "high end". Manufacturers have come and gone, but a few have managed to hang in there. Macintosh, Ampex and Marantz come to mind although they are probably under new management. I think the only equipments came from Germany, Great Britain and the U.S. Japan's Sony was starting to show up with their bare tape deck that was building a good reputation for itself. If you are older than 70 and from New York, you might remember the Hi-fi shows.

Being a combination of sophisticated electronics and precision mechanisms, this would have appealed to engineers of the day.

My first Hi-fi amplifier was a 10W, Bogen, PH-10. It was more of a pa amp than a Hi-fi amp, but that's what got me started in the world of Hi-Fi. Back then, there wasn't all that much available off the shelf, so experimenters like myself had to make a lot of our equipment. It helped to own an osciliscope, audio generator, a VTVM and a tube tester, all of which I had. We had to design and build our speaker enclosures and learn jow to deal with the problems that plagued early hi-fi enthusists, like hum, resonances and vibration.

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#1

Re: High Fidelity

08/13/2010 12:01 PM

Yup, I remember building my own horn loaded enclosures, great big 'uns and trying to stop my home built amp from motorboating, drove me nuts...it would pick up the local cab radios. I reduced the front end gain in the end.
Today audio quality has been sacrificed for small size, battery life and doomph doomph bass.
I dun care, I can't hear above 15khz.. what? I said is this Wembley? No it's Thursday. So am I lets get a beer...
Del

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#2
In reply to #1

Re: High Fidelity

08/13/2010 12:17 PM

I got back into hi-fi a few years back, after an absence of many years, when I bought a turntable with the idea of copying all my old vinyl to CDs. Found I liked the sound so much I haven't copied any. Instead, I now have a growing pile of parts & components for a range of projects from valve preamps to speakers to turntable mods to guitar amps, etc.

Must get some of them started soon, before everything goes.....DIGITAL.

Oops.

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#4
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Re: High Fidelity

08/13/2010 12:51 PM

Do you remember the Wharfdale and Goodman speakers? I built a folded horn enclosure of 3/4" plywood with a hollow baffle filled with sand from a design by G.A. Briggs. Valves (tubes) are very expensive today. I think all of them come from Russia. Now-a-days, I listen to all my music via computer feed to my stereo amp.

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#5
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Re: High Fidelity

08/13/2010 12:57 PM

"I listen to all my music via computer feed to my stereo amp."

Yeah, me, too, until I started buying vinyl again. The difference can be quite a bit if you get the right vinyl.

Sand makes some heavy cabinets! ;-)

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#3

Re: High Fidelity

08/13/2010 12:49 PM

I am much too young for all that, but there is a real resurgence with DIY Audio and building your own systems.

I took the plunge back into the things I did in High School; first with a recreation of one of my first speakers I built, but I modified the design so that it is a 3-way system using 15" woofers, 6.5" mids, and Morel tweeters. The science behind loudspeaker design has gone through leaps and bounds since the 1980s.

Next, I turned to the power amp and built my own 60 WPC KT88 based tube amp. Not much changed with the technology since the 1950s. Tubes now come from Russia (those Soviet military tube factories have found a new niche) and China. Some of these tubes are better than their originals.

Finally, I picked up a turntable and started hunting down some vinyl. I just recently snagged a audiophile grade of Steely Dan's Aja. I have the digital version on my computer, but the vinyl version is amazing! No added compression like most music today, which is mixed for iPods. It's not that digitalization deconstructs the sound, but the dynamic range of the original recording is so much more than the modern versions. Spinning records has its own mystique, too.

And a closer view of my amp:

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#6
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Re: High Fidelity

08/13/2010 1:01 PM

Nice job. It must be hard to find transformers and tube components today. I built a Dynaco 60W dual amp and preamp. What a great amp. One hi-fi expert I heard about could tweak a Dynaco with a few dollars worth of parts and make it perform like high end amps, like Bryston or Levinson, costing 10-20 times more. I'm sorry I traded it in.

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#7
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Re: High Fidelity

08/13/2010 1:10 PM

Transformers are from Edcore, a US company that hand winds them for very reasonable prices. There is about $360 to $400 in the transformers.

Tubes are from Parts Express, but there are better sources such as Tube Depot and Antique Electric Supply.

Parts are getting easier to find thanks to the resurgence of interest in vintage audio equipment.

Dynaco has been bought out by a company called DynaKit Parts. They make the kits now and they look just like the originals (ST35, ST70, Mark III, and Mark IV).

I found a working Dynaco PAS preamp on Ebay for about $125. I use that now until my preamp I am building is done.

There are DIY turntables people build that are amazing. That includes the arm, too. These are very sophisticated turntables and the machining is amazing with stainless steel platters and exotic materials in the arms.

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#21
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Re: High Fidelity

08/14/2010 2:24 PM

Hey ronseto,

I've been working on an old Bendix console radio/turntable off and on, probably manufactured in the 1930's. It's not hifi by any means, just a fun little project. I think all I've got to do is solder in a transformer and I'll be good to go. Anyway, I found tubes here, not real expensive either. The Chinese are still making them, of course.

As far as receivers go, I only use stuff from the 70's. Right now I'm using a big Sony and have a Marantz out in the shop. I don't like the sound from any of the new stuff.

http://www.tubesandmore.com/

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#22
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Re: High Fidelity

08/14/2010 7:41 PM

Have you replaced the electrolytic caps yet?

I am told that should be a standard operating procedure for any restoration.

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#24
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Re: High Fidelity

08/15/2010 12:04 AM

I don't know. I'm not an engineer. I do things by sight. You caught me! I think anyone that has been paying attention knows that I'm not an engineer. I just heard a rumor that engineers were the most fascinating people to hang out with, so I figured CR4 was a good place to start. I am actually working on this project. It's nice to know that if I get hung up, you and others are here to help. Nice try on the laying of your trap.

I take that back. I don't have a degree in engineering, but I am an engineer.

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#25
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Re: High Fidelity

08/15/2010 3:51 AM

Don't have a degree? Shame on you, me neither join the club.
Del

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#26
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Re: High Fidelity

08/15/2010 1:50 PM

Oh no!!! Sometimes I wonder if we outnumber the guys that do. I think the true engineers have come to like us, if for nothing else, entertainment.

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#27
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Re: High Fidelity

08/15/2010 3:44 PM

True engineers are born, not bred or trained. It's in the mind and the approach, not on the certificate. Agility with formulae and scientific method are great for proving/disproving things, but are no substitute for innate engineering 'feel'. Great discoveries/developments are more often than not the result of 'sparks of inspiration' that have little to do with training. Don't you think?

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#29
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Re: High Fidelity

08/16/2010 8:19 AM

I would have to agree. I am fascinated by lots of things from the way plants grow to why people behave the way they do. Engineering too.

I don't have a degree in anything, but about 25 years ago decided to stop reading fiction and only read things that would teach me something. I'm still at it, although many of the things I read about are not appropriate for this forum.

I also don't ask a lot of questions here when working on something, whether it's a furnace or a car. Google typically brings me to the specific information that I need.

I do enjoy CR4 though, for both self flagellation and public humiliation. Mostly to shoot the breeze with like minded individuals though.

Both my typing and spelling have also improved since joining CR4.

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#28
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Re: High Fidelity

08/15/2010 9:12 PM

I never would have known that CR4 existed if I didn't google, cat with a metal hat.Thanks a lot...............

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#9
In reply to #3

Re: High Fidelity

08/13/2010 3:16 PM

Oooh I bet there's room to squeeze into one of those ports and make a secret cat nest.
Del

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#10
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Re: High Fidelity

08/13/2010 5:01 PM

Could be, but we will never know with my German Shepherd Dog guarding it. ;-)

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#11
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Re: High Fidelity

08/13/2010 5:14 PM

<tippy toes quiety backwards mumbling 'Nice Doggy'>

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#12
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Re: High Fidelity

08/13/2010 6:18 PM

Sadly our cat died 4 years ago, but having had 11 dogs in as many years (Guide Dog puppies), including 3 Shepherds, if it came to pawsicuffs I would back the cat to win!

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#13
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Re: High Fidelity

08/13/2010 7:07 PM

Man! What a beautiful dog. With the precision machining centers available and CNC, I bet turntables and tape drives are more precise than ever. I'm pretty much out of the hi-fi market these days ($$$), but if I ever get back in, I would go with used high end stuff. At one of the early hi-fi shows, there was a demonstration of a turntable playing a record in a non-conductive, non-viscous fluid and upside down. It was a gimic, but all the same, it demonstrated how frictionless a turntable/arm combination could be. I saw a lot of fantastic equipment that is no longer available. I wonder what happens to that equipment. I tried to find it on the internet, but nothing. It must be in a museum somewhere.

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#14
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Re: High Fidelity

08/13/2010 9:20 PM

Empire turntables were demonstrated upside down, if memory serves.

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#18
In reply to #10

Re: High Fidelity

08/14/2010 8:25 AM

He looks like Alsatian.

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#19
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Re: High Fidelity

08/14/2010 8:51 AM

Correct. We use German Shepherd Dog (GSD) in the US, but I understand the term is the same. Her bloodlines are from Germany and she is a pure bred, high energy dog.

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#15
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Re: High Fidelity

08/13/2010 11:53 PM

You don't really make this gem sit atop that wart of an enclosure, do you?

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#17
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Re: High Fidelity

08/14/2010 7:48 AM

Yes. ;-) The enclosure gets a veneer of koa wood as soon as we complete room renovations. So, it will look a whole lot better soon.

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#20
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Re: High Fidelity

08/14/2010 9:10 AM

I'm sure it will look great when finished.

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#23
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Re: High Fidelity

08/14/2010 8:31 PM

The vinyls had a lot of compression on the low end that I got rid of with the help of DBX expansion/compression circuitry. I still have most of the equipment including three cassette decks and a Teac reel-reel deck, all in great condition. I also have about 200 LPs; not all vinyl.

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#8

Re: High Fidelity

08/13/2010 1:30 PM

Parts are pretty easy to get, especially with the help of the internet, but transformers and valves (especially transformers) can be pretty expensive. With a wife and 4 kids (and working in engineering!) I have a very small budget, but it's still amazing what you can do. I've been messing with chipamps (gainclones) & such, the transformers & PSUs are the most expensive bits. There's a lot of DIY going on, and as AH says, some of the work being done on turntables is quite amazing. My efforts are quite simple and modest.

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#16

Re: High Fidelity

08/14/2010 12:48 AM

Thanks, Ronseto for the walk down memory lane.

The first amp I built was an Eico, with tubes -- an ST 40, I think. I built the speaker enclosures, hand wound the crossover inductors, and later built a turntable and its tone arm.

I had the Eico for about 40 years before selling it to a good home.

Rumble, wow and flutter.

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