real mctube bass boost switch

[george79]

Hello,
i just finished one real mctube 12ax7 pedal for a friend.He is playing bass.The pedal working good and have a good amount of basswith the stock parts.My question is can i add a bass boost switch (something like the B15 ultra low switch)?
what do you suggest in capacitance and where to stick it?

Thanks

[PRR]

"The "2.2nFd" might have to be 5n or 10n to get ULTRA-low. The 2.2n will WORK, but perhaps "too well".

[george79]

Thank you!!!!!!!!!!!!!!!!!!!!!!!!!!!

[george79]

is it better on the second stage or in the first stage to add the cap?I saw in the ampeg B15 schematic where i got the idea,that they used the cap in the first stage.

[PRR]

Copying the B15 is not a bad plan.

But because the McTube needs that heavy 1Meg:100K cut-down at the end, you can also try it as shown, and less re-working.