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In Reply to: RE: Grid Current posted by vinnie2 on February 24, 2019 at 17:59:00
I'm not an expert in SRPP but I don't think so. It may help the output impedance and distortion but it wont provide grid current.
An IT transformer or a mosfet (grid drive) would be better suited for this or run the voltage up a little higher.
With your current driver and voltage, not sure you will get more than a couple watts on a low voltage 845. Those transmitting tubes start pulling grid current early.
You can do better using a 300B and its easier to drive. I would use some DHT's to drive it as well.
Follow Ups:
Actually, I can live with a couple of good watts with my Altec's. I am playing one channel in mono right now, and I do believe it would play more than loud enough for my tastes with a stereo pair. Sooooooo, before I spend any more effort on this project I am going to breadboard the other channel and see how it compares to my SET 2A3. That is the amp it has to beat to stay in my permanent setup. I already determined a while back that I like the SET 2A3 better than the 300B model 91 clone it replaced.
Edits: 02/25/19
If your are referring to the WE 91 you probably didn't like it because of the pentode drivers.
That sounds like a good candidate for another breadboard project one of these days. Would you happen to have a schematic of a good one you would be willing to share?
You don't really need much of a schematic, simply run any DHT at its op point and couple it with a cap.
Here's one I did back in the day, i got about 6-8 watts depending on transformer
nt
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