Harmony H-307 schematic

[MarkusBass]

I'm looking for schematic of Harmony H-307 tube amp. I've seen H-306 schematic but it is slightly different from the amp I'm fixing.

Mark

[Enzo]

So what are the slight differences, and are they involved in the part you are fixing?

If the differences are slight, perhaps print out the schematic that is close, then make changes on it to reflect the version you have. There are H306 and H306A out there. I don't know just what the difference is, but could the A version be closer?

On an amp this simple, if there is no published drawing, I often just draw one up from the circuit.

[MarkusBass]

Thanks for the answer. There are some modifications in the amp which I would like to revert to the factory version. The power supply section is heavily modified (additional capacitors, resistors). There are some modifications in the neighbourhood of the rectifier tube (added resistors). And the transformer is not original - there is a chance that it has incorrect voltages. Many resistors are not original - they could have been replaced with the same (correct) value, or maybe not. I'll try to draw the schematic.

Mark

[g1]

Not free but cheap (if the x version is no problem):
H-307X schematic [HarmonyH307X] - $5.00 : RonSound, Yesterday's Technology Today

[MarkusBass]

Thanks for the finding. I bought it from them but as for now I haven't got the schematic, nor a link to download it. They were happy to accept my money but now they do not respond to my emails :-(.