GK 400rb III, heatsink isolated screw

[cigskillu]

Just performed the fan circuit repair on a Gallien Krueger 400RB III and i did not take note of where the one isolated screw goes. Does it go to Q29' the temperature sensor?

Thanks,
-Will @ Vertical Amplifiers

[Jazz P Bass]

An isolated screw usually will mate with a thermal insulator.
If the back of Q29 is metal & the metal has a voltage on it & the heat sink is not at that potential, then yes.

[cigskillu]

Its has been confirmed by GK' that the insulated screw goes to 'Q29- the temp sensor. They also sent me the schematic, now time to mod the 400rbIII for a 12volt dc fan so i don't have to order a 24v one.