Reverb using two triodes

[octal]

I just got done trying a couple of different cap coupled circuits and the one described by merlin on his site is really good.
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I've had good results with it too. Did you use his input attenuation & filtering network? I found that the design drive level (100 V p-p) was far higher than the signal level anywhere in my preamp & had to make some pretty drastic adjustments.

[diagrammatiks]

I have a pot right now at the input of the circuit into a low value grid stopper and a pot after the recovery stage.

I just finished it a few nights ago so I'm still tweaking. The circuit for just the reverb works with the srpp and a driver triode. I ended up using 6 stages for an effects buffer, reverb driver, effects return, reverb return, virtual earth mixer. I'm going to go back and streamline some stuff though since I technically don't need so many branches but it's nice having completely independent control over each part of the loop.

[octal]

Oh, I missed the part about it being the SRPP version. I was talking about the version with the two 12au7 sections in parallel to drive a 1.5-1.7K tank where he shows that high pass/low pass filter /attenuator circuit at the input. It's good to know that the SRPP version also works well too though.

Nathan

[Bruce / Mission Amps]

Adding 1-tube reverb

Try the link above. With respect, Tubenit

Hey Jeff, are you still using that VVR type power mosfet in the B+ rail?

[clyde1]

I've used the 2 triode reverb circuit above very successfully, however I use 820 ohm cathode resistors paired with .47 or .68 caps on both cathodes. It's definitely not over the top, but like Bruce says, most BF amps never see more than 3 on the dial.

[Wombaticus]

Oh, I missed the part about it being the SRPP version. I was talking about the version with the two 12au7 sections in parallel to drive a 1.5-1.7K tank where he shows that high pass/low pass filter /attenuator circuit at the input. It's good to know that the SRPP version also works well too though.

Nathan

Nathan, how did you end up tweaking the attenuation network of the 12AU7 version? What kind of context was it placed in the preamp?