non-HRM Opinions Sought

[dogears]

Yep....

But the only high plate amp I know of with 4.7uf on CL2 had a .01uf coupler. That is what I referred to.

I stand by my comment that a .05uf coupler on high plate load amps, with 4.7uf bypass, is thuddy and buzzy in the OD (as well as NEVER being documented as being in a Dumble).

Is there a well documented non-HRM amp with high value plate resistors out there? I'm just trying to make sense of it and refine my amp.

CL1 220K, 3K3, 5uF
CL2 150K, 2K2, 5uF...will try 1.0uF someday, .047uF pass cap
OD1 180K, 2K7, 5uF, .022uf pass cap
OD2 120K, 1K8, 1uF, .005uF pass cap
2/4/8 Super Reverb OT fwiw, and thanks to everyone responsible for turning me onto the Vishay MFs and MPPs.

I have seen more than one high plate amp, non HRM, but they have been 220K/150K for both V1 and V2, have had a 1uF bypass cap on V2 and a .047 CL2 coupling cap. An earlier version was the same, but with a .022 CL2 coupling cap.

Cheers,

Gil

[jaysg]

Scott, I think I see....if I replace CL2's 5uF with a 1uF, I leave the pass cap at .047uF, otherwise, make it smaller.

Gil, did you mean that both V2 cathodes were 1uF? Interesting about the plate resistors.

[dogears]

Yep!

And I am pretty certain Gil meant V1b only....

Scott, I think I see....if I replace CL2's 5uF with a 1uF, I leave the pass cap at .047uF, otherwise, make it smaller.

Gil, did you mean that both V2 cathodes were 1uF? Interesting about the plate resistors.

[ayan]

Gil, did you mean that both V2 cathodes were 1uF? Interesting about the plate resistors.

Sorry, what I meant to say was that V1B had a 1uF bypass cap, the rest were 5uF.

Gil