Electronic Engineering

I am electronic of field, like your stranger the electronics of the transistors, today is use and to Trash can, work from 1982, I have lived the change, and I have learned that no matter how hard it is he himself model of equipment and a similar fault never is the same one.

I am repairing an ultraspeed centrifuge Beckman of 55000 rpm, of the years `80 without manual and diagrams, have been 5 days with the equipment and in two days more I send repaired.

I feel well, with this type of equipment.

I do not like the new ones, are very easy, and two alternatives: trash the only card, or to the full equipment.

excellent job, staying with it, that gets the job done. www.ghbalancer.com Yes we sell equipment that balancing the centrifuges. Sell balancing equipment to balance rotors all the way up to 150,000 RPM.

My belief the older equipment as you is built better, don't throw the old boards out, put what is wrong with it, put it up on your shelf, later on if you are slower, I repair the old board for replacement later on when I am in a good mood, and can take my time, 98% of the time I can repair the discret device board and have it in working shape, you can get all the parts for the boards of 1980.

Cheers, Balancer-Man

I live in Peru, here never get the same part, this equipment has an EVG31-050 I replaced by MJ10023D for controller the speed of motor, it work well, don't have more problem = client happy, I take two days more for check operation.

You have the diagram of L7-50 Beckman?

You have a nice work too, is a game for us. Who win? - The problem or the creativity.

Sorry had two reply one India and yours from Peru. What type of drive is it variable speed AC or DC and how much horsepower ?

One smart guy is: Philip R. Asao www.buycontrols.com PH: 612-475-2348 From Mound, Minnisota, an AC and DC Drive expert, he helped me perfect for an Eddy Current WER 10HP drive I got all new board for it from him, excellent service and yes he is an Engineer.

Hope that helps you. Regards, Balancer-Man

I too belong to your catogery. Working to feed self & family since 1975. Maintenance man, Electro mechanical. Worked on vacuume tubes, pelton wheels and PIC contollers as well. 4 years SPM manufacturing-Electrician cum mechanic, 6 years Civil cuntruction Electrical, Electronics & mechanical section head and head for Tower crane errection/ dismantling, 4 years maintenance with Gillette, then for 14 years with 3 Semiconductor manufacturers. now with a battery manufacturing as Electronics mantenance head. Though I got oppertunity to switch over to production, I rolled back to maintenance. I love repair work; eletronics/ electrical/ mechanical; no schematic? no mannual yes I take it as a challange and enjoy more. Only problem with this proffession is no security, no money for my old age, thankless job. If I repaire easily no one recognises. If I get some funny IC from over seas; the import manager takes the redit; but still I enjoy fixing equipment problems. Dear friends please share any joy you had while fixing technical problems. I have many to share with you if any one is interested.

Thanks for your reply. Do you eat Dal Palak, love it, we have a very large population from Indai here.

If you have internet, you should be able to get more schematic for the equipment, have pride when you go home that the machinery is working. I just need the customer to pay on tiem.

I am signing off, up early today it is: 5:14am central time.

Balancer-Man

Hello, Yes I do have Dal Palak. I am South Indian but lived many year in North India. Hence I enjoy all types of vegiterian dishes.

I started as technician with the US Navy, enjoy digital, many years later earn my living with software - But loved and miss vacuum tubes. They were amazing.

The Stewart-Warner Amplifier from 1956 to 1970 used 12AT7 amplifiers called dual triode, the funny thing is that the Kenwood stereo uses front tubes the same two of the matching HFE of 90 12AT7's was rated the best stereo amplifier in the world and the cost dictates that, some $24,000.00 for that amplifier, still can get all the vacuum tubes most are american made, like General Electric and Phillips make them.

Want to build a little amplifier I can provide the tubes for you.

Balancer-man www.ghbalancer.com Have a look