Ampeg SVT -350H schematic

[pbdog]

Looking for an ampeg svt-350H schematic. Having cooling fan problem. Thanks pb

[Enzo]

The fan normally runs slow off the +60v through the two R54s to ground. When heat sensor IC1 gets hot enough, it turns on Q18 which adds in another 470 ohms R55 in parallel with the R54s. This speeds up the fan.

[slideman82]

Hi! Do you still have it? the orange wire from power transformer is lose, and I dont know where it goes!