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jefrs · February 7th, 2008, 07:49 PM

Sorry, should have read the question.
Even so, I've looked over the documentation and it seems that one of the two channels has an SS pre-amp. And it is also not at all clear if the EQ applies to both channels? Finally, how does the effects loop function? Is it serial or parallel? The block diagram shows a sunmming-mixer post pre, reverb, and return. How does THAT work?

To answer:
No, it does not have a solid state pre-amp: "all tube class A". Both channels use V1a. There's a bright switch that may have different values for each channel (DPST?). The drive switch adds in V1b for extra gain. Then V2a and V2b go into the tone controls. The FX loop is in parallel with the reverb (I'm not sure what drives that). Then half of V3, another tone control and the EL84. The block diagram is a bit poor. The capital sigma usually means summation - I think it means signals mixed but that only occurs at reverb+FX return; at the first sigma shown the drive volume is only effective when the drive channel is selected. Valves are V1= ECC83/12AX7 "higrade"; V2+V3= ECC83/12AX7; V4= EL84. It's not cheap but this is one very, very flexible amp.

February 7th, 2008, 07:49 PM	#23 (permalink)
jefrs Tele-Holic Join Date: Nov 2007 Location: Newbury, England Age: 53 Posts: 590	Sorry, should have read the question. Even so, I've looked over the documentation and it seems that one of the two channels has an SS pre-amp. And it is also not at all clear if the EQ applies to both channels? Finally, how does the effects loop function? Is it serial or parallel? The block diagram shows a sunmming-mixer post pre, reverb, and return. How does THAT work? To answer: No, it does not have a solid state pre-amp: "all tube class A". Both channels use V1a. There's a bright switch that may have different values for each channel (DPST?). The drive switch adds in V1b for extra gain. Then V2a and V2b go into the tone controls. The FX loop is in parallel with the reverb (I'm not sure what drives that). Then half of V3, another tone control and the EL84. The block diagram is a bit poor. The capital sigma usually means summation - I think it means signals mixed but that only occurs at reverb+FX return; at the first sigma shown the drive volume is only effective when the drive channel is selected. Valves are V1= ECC83/12AX7 "higrade"; V2+V3= ECC83/12AX7; V4= EL84. It's not cheap but this is one very, very flexible amp.