• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Transformer in the cathodes ??

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Bandersnatch

Member
Joined 2003
hey-Hey!!!,
The screens have a dropping R from B+ and a cap bypass to the cathode node. I tried ref'ing them to ground with various regulators and with signal on the cathodes( and thus a signal-varied g2-cathode voltage) found the results not to my liking.

I found the ratio of g2 to anode current smaller in the 6AC7 v. the 6AU6. The 6AU6 is a very fine small pentode, very reasonable claim to being the 6SN7 of pentodes...linear, useable( and useful ), etc...:)
cheers,
Douglas
 
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