Mu of the triode section is ~50 and I'm guessing that gain is fairly close to that, so you're driving the pentode section with +/- 50v, which will cause clipping. You have probably hit the max power output of the tube. More efficient speakers may be called for, or paralleling multiple tubes, or push-pull operation.
It could be. Will try paralleling pentodes. I don't think I'll be able to get speakers more efficient than this.
Oh BTW, the input of my transformer is around 50Ohms and the output is less than 0.5, driving 2 6Ohm speakers in parallel (3Ohms).
Hey
It's so weird that paralleling the pentode parts of the tubes either increases the distortion or lowers the amplitude :/
I really don't know what I'm doing wrong.
I connect the pentode section to the other tube's pentode section.
Oh I just remembered to tell you guys that I was able to get 2C39A for under $10 in an auction. Do you think it's possible to make an audio amplifier out of it? It's pretty beefy.
I bought 3 12AQ5s with sockets (Finally) and thinking about changing the pentode of the PCL805 with these to get the extra power. The datasheet says that the maximum g1 voltage in an amp circuit should be 8-12V. I'm guessing I need to lower my triode's output voltage with load resistors?