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Re: Audio Research D70

Hi
I used to own a D70 MK-II and sold it. What a mistake!
Anyway, the screen regulator circuit uses a 12Ax7 / Ecc83 tube to drive the grid of a 6550 used as a pass regulator.
USA-made NOS 12ax7s usually have a slow warmup heater, while european tubes flash like a strobe when turned on.
I found out the using a slow warm-up tube delayed the screen supply just enough to get rid of some warm-up noises (from the output tubes).
Any OLD GE < Sylvanya or RCA will work fine.
I hope this helps


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  • Re: Audio Research D70 - Carlos 09/10/0514:48:59 09/10/05 (0)


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