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Old 19th April 2005, 01:18 PM   #1
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Question Different input valves for KT88

I'm thinking of building this amp but was wondering if I could use an octal instead of the ecc83 as I have achassis with PSU that I could use for it.What changes would I need to make to use 6sl7 or 6sn7?
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Old 19th April 2005, 07:10 PM   #2
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ECC83 is a Euro-name 12AX7 HI-Mu twin-triode.

Frankly, I think that plan has too much gain already. Maybe that is why it has the 68K grid resistor (500K would be quite safe).

So use 6SL7. Mu is a little down from 12AX7, maybe not enuff to notice. Look-up the base diagrams.

You might try changing the 1K cathode resistors a little higher or lower. My guess is that 1K4 is a good starting place for 6SL7, but I'm not inclined to analyze an SRPP today.

Experiment with a much higher KT88 grid resistor.
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