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Old 26th September 2006, 03:16 PM   #1
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Default AMC CVT 2030 Output Transformer.

My AMC CVT 2030 Power Amplifier's output transformer has blown. Can anyone give me the specification for the ouput transformer? Since AMC has stopped production of audio products, I'm unable to find any spare part for my power amp. I have found a local company which is produce transfomer. But the incharge person told me they need to know the specification of the AMC ouput amplifier. So I would like to ask you all who know the AMC output transformer specification so I can make a new output transformer for my power amplifier.
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Old 2nd October 2006, 08:02 PM   #2
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Default AMC CVT 2030 OPT

Go to the AMC site - customer support. I find them to be very helpful. They emailed the CVT3030 repair manual to me within 24 hours of my request. I just today sent a request for the CVT 1030 repair manual and a mainboard.
Give them a try........

Kevin, aka firenewt
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Old 3rd October 2006, 11:11 AM   #3
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thanks
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Old 4th October 2006, 08:15 PM   #4
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brent from retrodazeaudio is probably the smartest guy around for these amplifiers. i have no affiliation with him. he seems to answer back quickly.


www.retrodazeaudio.com
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Old 4th October 2006, 08:43 PM   #5
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hi matthewong,
It's very unusual to find one of those xfrmrs blown! Yours is only about the second one iv'e heard of in over 10 years. They are proprietary and were uniquely wound by AMC in Taiwan. Have you called AMC to ask it you can purchase parts from them? They might be able to part from a used output tranny...
Dave
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Old 5th October 2006, 02:23 AM   #6
anatech is offline anatech  Canada
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Hi Matthewong,
I've never seen one blown. I used to do warranty on them in Canada. No surprise they don't sell audio anymore though.

Two things you have. The core size and rated power, plus you know it's running EL34's. Why they soldered them in I'll never know.

Secondly, you have another good one you can measure to get the turns ratio. Send it in to get copied or measured. My vote is measured and buy th eclosest stock unit.

Now, AMC was a value priced product. I would not be surprised that a new output transformer might be a substantial upgrade. While you're at it, pull the tubes out by any means that saves the PC Board. Install sockets and put a good matched pair in. You will need to cut a section out of the "U" bracket that holds the board.

-Chris
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Old 5th October 2006, 03:58 PM   #7
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I own one of these and have repaired them as well. The irons are top notch and designed by the the engineer of the early NAD line. Their value priced phylosophy was based on the modular design makeing it cheaper to manufacturer. Soldering the tubes was intentionally done as it "sounded" better. It was also before the tube rolling craze. And by soldering the tubes in they were able to attain the european "UL type" certifications Semco, Nemco, Demco etc. This was quite an acheavement for a tube product and was for selling/marketing purposes.
As far as 'copying' the transformers...I dont know. They were made after many weeks of experimentation with a lot of tricks to make them perform and sound better and be reliable. anatech is right. Even IF you were able to replace them the new transformers will undoubtedly sound different. If affordible it might be a good idea to replace them both.
It would also be a good idea for several reasons to replace the soldered tubes with sockets.
The main reasons are for the heat transfer and for general replacement/repair.
This is one of the best sounding sleeper tube amplifiers on the market. There are several tricks you can do to make it sound even better.
Just out of curoiusoty what tubes are in your unit. Some of the earlier units had Siemens tubes in them.


-Dave
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Old 5th October 2006, 05:48 PM   #8
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Today I have found a factory that really making audio transformer, but the price is a bit expensive, but I don't care, I just need to fix my power amp and make it run again. The staff there told me they need all the specification to make a new one, but I'm not dare to give the good one OT to them, if they can't make it, my AMC power amp will gone forever. I have sent email to AMC, but they never reply my email. So does any one know the specification for the OT? I got the service manual and there is a page for OT, but I don't understand the diagram.
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Old 5th October 2006, 06:32 PM   #9
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BTW, what side is the transformer: R or L?
-dave
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Old 5th October 2006, 06:59 PM   #10
anatech is offline anatech  Canada
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Hi Dave,
Did you work at AMC in the States? I may have dealt with you. If so, you were the most helpful person I came in contact with, and for that I thank you.

Long story short. The AMC line was purchased from the factory with zero warranty. The distributor in the country that sold the equipment was responsible for warranty and parts costs. In Canada, parts were generally unavailable because the Canadian distributor did not buy replacement parts until the 11th hour, then not enough.

I have trouble understanding why a tube socket would stand in the way of safety approvals. Other companies did just fine. Possibly this was the least expensive route they could take. That I'll believe. They then shifted the costs to the consumer. They were not happy about this. Also, it takes more than weeks to design an output transformer from scratch. What I believe happened was they took an inexpensive transformer and tweaked it to be acceptable. Nothing wrong with that. I would have great difficulties in believing that those transformers were better than a stock Hammond. Edcor may have a perfect replacement actually.

A transformer can be copied. Once you have the transformer in hand you can measure all electrical characteristics. You can easily do the metallurgy and unwind it so you have all the details. There are companies that do this. I will bet most stock transformers will perform better. They just cost more. This matters for manufacturing, but not nearly so much for the end user buying two.

-Chris
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