6P41S / 6∏41C at high voltage?

[deafen]

I finally got around to this, and it's now done. Yes, I know that this probably belongs over in Instruments/Amps, but I started the thread here, so I'm leaving it.

• The preamp is basically RobRob's BlackVibe, minus tremolo and reverb. My original plan was to use an Accutronics BTDR-2 for reverb, but I ran out of places to put a pot and I couldn't figure out exactly how to integrate it into the circuit. Hanging on to that one for another future project.
• The power supply worked out as planned, taking advantage of the half-voltage node in the doubler to run the screens.
• B+ is 455V, with 450V on the plates.
• Screen is 215V.
• Bias is -40V from a cap-coupled supply.
• Dissipation is about 17W.
• Right around 35W clean power output before clipping.
• It sounds glorious. Pure BF Fender.

No signs of trouble - no redplating, no odd behavior, despite being mildly above rated values across the board.

Here's the power and bias supply as built:


And here's the circuit as built:

 

[TheGimp]

Post 34 has an English translation of the 6P41S datasheet:6P41S Datasheet

 

[deafen]

Thanks for doing that! I used those translations more than once during my process.

 

[Kay Pirinha]

60 W output power with a pair of these tubes, as per page 3, is rather impressive !

Best regards!