Sonzera 20 preamp tubes


New Member
Oct 12, 2018
The latest Sonzera 20 has the preamp tunes:

V1 12AX7 / ECC83Common Input Gain Stage
V2 12AX7 / ECC83Gain Channel
V3 12AX7 / ECC83Reverb
V4 12AX7 / ECC83Phase Inverter

The gain channel has too much gain for me. If I swap the 12AX7 in the V2 channel for a 12AT7 or even a 12AY7 that will reduce the gain won't it? I won't blow up anything by doing this will I?
Everyone, thanks for the input (pun intended). I'll get a 5751 ordered and let you know how it goes.
You might also try a 12AY7 in V1 alone or in addition to the 5751 in V2 (a good call). The effects on gain reduction are compounded with each earlier change in the circuit.
I finally got a chance to pop in the 5751 (thanks DTR for the suggestion) and so far I am really pleased with the reduction in gain. It's a more vintage overdrive sound now and the increase in OD is more gradual as I sweep the dial.