Output Buffer with Volume Control for Unity Gain

[Big Monk]

Long story short: My TC Electronic Drip Spring Reverb has an incredibly rich spring reverb tone but falls short, noticeably, from unity gain.

TC Electronic won't give me the schematic and punted me to their service vendors. Service Vendors are of course not going to give it to me either. Anyway, it's all SMD anyway so it would be a paint to modify, even if it was only changing the divider ratio that I am sure exists on the tail end.

So, I was thinking that I could use a simply JFET buffer with gain control after the reverb, built into a little tap tempo box, like the one used on Tonepad's Buffered Wah schematic:



If I am correct, the 2N5457 should only have about 6 dB on tap and could be easily set with a volume control to match unity if put after the reverb.

Any thoughts or suggestions?

As a side note, my Carl Martin Surf Trem has the opposite issue, as it boosts the signal a touch over unity when engaged. That has normal through hole components, however, and East Sound Research sent me the schematic with no issues. Just need to tweak the voltage divider on that one.

[antonis]

So, I was thinking that could use a simply JFET buffer with gain control

Buffers can't be used as variable gain configurations..

P.S.
You need a common Emitter/Source amplifier..

[Big Monk]

So, I was thinking that could use a simply JFET buffer with gain control

Buffers can't be used as variable gain configurations..

P.S.
You need a common Emitter/Source amplifier..

So the picture of the schematic shown above won't work? I simply copied out of the Tonepad Wah schematic. I have plenty of suitable BJTs if that's what it will take. I'm just looking for a small signal boost right after the reverb to get it to unity gain. I am putting them in a loop by themselves on my board.

[antonis]

So the picture of the schematic shown above won't work?

It will perfectly work as an almost unity gain buffer with output LEVEL adjustment..

I'm not sure if that's your wish..

[Big Monk]

So the picture of the schematic shown above won't work?

It will perfectly work as an almost unity gain buffer with output LEVEL adjustment..

I'm not sure if that's your wish..

What I really want is a slight boost controlled with a Level control.

[antonis]

Just copy Big MUff Π last stage or something similar..

P.S.
Sir Mike could suggest you some excellent MosFet boosters...

[Big Monk]

Just copy Big MUff Π last stage or something similar..

Thank you Sir!