Available as an assembled Module and as a DIY project.
This Module is currently available.
High gain sub-miniature vacuum tube based overdrive
ThermoNuclear is a sub-miniature vacuum tube based overdrive. The first stage is a MOSFET with switchable mu-amp. The second stage is a self biased sub-miniature pentode with switchable triode/pentode. Then there’s a tonestack based on the EH Big Muff. Finally, there’s a blend control and another MOSFET stage for some gain recovery after the tonestack. ThermoNuclear will crush and destroy your tone with a pleasing warm tube-y goodness.
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These merchants probably sell this module. Huh?
Frequency Central Thermo Nuclear (Tube