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In Reply to: RE: Tube amp PS posted by wrm0325 on May 03, 2016 at 17:32:06
You might want to check this article where Jac suggests replacing 6SN7 types with the 20B. The point I suggested runs the current higher and therefore the the grid to cathode -V lower, but the plate to cathode V is roughly the same.
Cheers,
91.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein
Follow Ups:
Hello 91,
sorry it took so long to get back. Been a little crazy.
Appreciate this. Saw it before when I first investigated the EML tubes, but didn't pay it much attention. I am now.
Clearly, it adds credence to the operating point you suggested. But what really stands out is the suggestion of a battery supply as noted in # 6.
Looking into this very seriously.
On another note to you or anyone else.
When I was playing around with small signal nine pin triodes ( 6922, 6n1p ), types, I used Shunt type gas regs in the PS to great effect. I could easily stack a couple of OD3 and then a RC section to bring it down to where I want to feed the 20B.
Anybody ever use gas regs to feed a DHT such as the 20B.
As always, ANY THOUGHTS are much appreciated.
Cheers, Crazy Bill
Hi Bill,"Anybody ever use gas regs to feed a DHT such as the 20B."
I'd say yes, someone will have. People's opinions will differ regarding whether shunt regulation will have any benefit or is worth the effort for these decent-sized DHTs performing line level amplification. I would first try a conventional approach... that provides low impedance, quick recovery, and isolation from the output stage node. With the voltages required, a LC PS node could be very nice.
I think low Rp tubes warrant some stage PS design if they are to perform well.
Cheers,
91.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein
Edits: 05/09/16
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