Trouble finding diode in Fender "The Twin"

[rascalrick]

Sorry for the confusion. I meant that the schematic that I have is the corrected one that doesn't show a connection between the V7B plate and the tone stack. Apparently there were some earlier versions of the schematic that showed a direct connection that were corrected later. All I know is that the previous poster showed the board with the zener diode next to LDR101, and my board does not have it there. I still cannot find D108 anywhere in this amp. The voltage on pin 3 of the LM339 was 30vdc before I replaced it, but now with the new LM339 in place the D power supply is 44vdc, and I am trying to locate the diode to see if it has failed.

[g1]

I have only found a couple online, and this one has the correct connection between V7B and the tone stack.

Are you saying there are others without the diode that have a different connection between V7B and the tone stack? They are for "The Twin" ? What revision letter are those schematics?

[rascalrick]

Here is the portion of the amp with D108.

[rascalrick]

This is the corner block of the schematic that I have. I am not sure if this is the correct one for my amp. I have only found a couple online, and this one has the correct connection between V7B and the tone stack.

[Jazz P Bass]

Can you post what documentation that you have indicating "D108"?

[rascalrick]

Thanks, I'll keep searching. It's hard to find "the twin" stuff..most everthing comes up as just as the original twin. Why on earth did Fender name it The Twin???

[mikeydee77]

I see what you mean. I only have one version of the schematic 026059 rev N. I guess there are multiple versions then... Trawl the web and contact nice fender folks

[rascalrick]

I thought my old eyes were failing me, but low and behold that part isn't on my board (at least at that location)!

[mikeydee77]

it is the little yellow guy next to the vactrol LDR and near IC101, or am I wrong?

[rascalrick]

I am working on a Fender The Twin amp and cannot find D108 (30v zener) anywhere on the 4 pcb's in the amp. I am pretty sure it needs replacing as the voltage on the D supply is 44vdc instead of 30vdc (or slightly less with various input configurations). Does anyone here know where that diode is located?