[Ynze] has built an audio amplifier that looks and sounds great ... This can be some tricky soldering for beginners, but several PCB kits are available. [Ynze] built his amp in two cases.

The 6J1 seems to be ubiquitous throughout the Chinese kits, which is surprising when you understand that it’s not an audio tube at all. Instead it’s a small-signal VHF amplifier, a rough ...