#094 build it?

[grtamp]

Has anyone ever built an amp with #094 scheme? it is a final schematic or there are points where some values are supposed?

it's strange to me , compared to other schemes ,there's not 500Pf cap on V1b grid,only 220k. What's the difference without this cap?

Thanks

[grtamp]

Thanks for helps!

[stevlech]

I guess since there are no other replys, I'll take a swing at it...

The cap you mentioned forms a high pass filter and Dumble didn't always include it. At least a few "classic" amps don't have the cap.

And no, I haven't built the circuit in the schematic.