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I run my valve in the Frog Ruggedized at about 210VDC, but even at 150VDC, you will do fine. I have designed an Ampeg B25 PCB and one thing I have learned is that it works fine for both guitar and bass, because the preamp and tone stack is designed for the full range of guitar and bass. In...

Good question regarding the power supply noise on the Frog Fx1 Tube Preamp. The onboard step up SMPS runs at about 33khz so way above what we can hear. In that respect, it differs from the alembic f2b. The schematic is the same as the Alembic F2b except I added a Mid Boost mod, 2 diode...

I wish I would have seen this post earlier! I am Mark with frogpedals.com. I hand build a tube preamp that is based on the Fender/Alembic F2b circuit. You can see it and the documentation on my web page and follow on Facebook. Search for frogpedals. There are a few videos of some people...