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Thanks, KM

It makes sense but I do not like to burn those tubes at max plate dissipation.  How about if I put one more RC chains in PS and drop anode voltages from 400V to 350V? Then if burn let say 60V in cathode then I arrive to a comfortable 290V on plate. If I run the tubes at 40mA then they both will be at 12W dissipation and it is what I would like them to be. I asked Dima to help me to calculate the circuit for this or for the similar to this operation. Can you check where your distortion numbers will bed? I think at 350V from PS I might be able to drive both tubes with just one switch of cathode resistor shunt.

About the 6A3. I did try it as I did not have any problem. Also, do not forget that I will be running it HF only and if a slightly higher 50Hz noise is there then it is not really auditable. Yes, the modulations might be there but is it the proof in a pudding?

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