The order of tubes. HT-100.

[Tawlks]

For future reference.

The one closest to the power valves is always the P.I. Which is also the last preamp valve, in this case V3. For the purpose of non-technical discussion, they're in order, V1, V2, V3. This is the case with this amp.

Some amps, such as the Peavey 5150 mixed up the order of preamp valves. For some odd reason.