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Vintage Asylum Classic gear from yesteryear; vintage audio standing the test of time. |
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In Reply to: Re: Fisher 800C schematic posted by PeterI on March 27, 2007 at 06:35:49:
Adding the resistors lets you pick the best matched tubes if you have any extras. I used 10 Ohm, 1/2W. At 50 mA there's 1/4W of heat, and they usually are biased about 30-40 mA. A 5W part won't protect the output transformer... If you're gong to use modern tubes (only JJs will fit if you have a case...), you might want to reduce the grid resistors to 220K or 150K and increase the coupling caps by the same proportion. This may keep a tube with marginal leakage or grid emission from going "runaway".
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Follow Ups
- Re: Fisher 800C schematic - Tom Bavis 08:34:10 03/27/07 (1)
- Re: Fisher 800C schematic - PeterI 08:54:52 03/27/07 (0)
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