There are about a zillion people on the net modifying these little tube amps, but most mods seem to be focused on adding features like a tone knob, a gain knob, or a totally useless standby switch. We aren't concerned with adding features, instead we will focus on refining the tone, which is fizzy, brittle and uninspiring in stock form. This appears to be the second version of the circuit with the DC filament supply.
FOLLOW-UP VIDEO: https://youtu.be/xMpWcFX4wAg
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