24/01/2016
Fixed it, Yeah Baby The British invasion has returned.
Everything works like it should ,I actually fixed it.
With the help of Stephen Grosvenors readable schematic.
There was so much wrong it amazed me it had ever worked at all.
The caps were all burnt up (literally a crumbling chard mess) leaking DC and/or the wrong values.This was probably due to the B+ being connected wrong (LMAO when I saw it) .
The resistors on the power tubes had all drifted to near double the value they should have been.
The phase inverter tube V2 circuit was, to use a technical term "nackered"
The brilliant channel didn't work because C3 had exploded at some point in it's life,
I found wires that weren't really connected they just had the insulation stuck to a lug.Lots of lugs were broken (I broke One which for a novice isn't bad I reckon.) I actually repaired all the broken turret board lugs with new ones.
The list is endless really.I shall make a video next week.
I did some measurements and calculations and found the EL84 plate dissipation a bit "Hot" 14,5 W so I upped the cathode resistor to 90 Ohms and got it down to 12,5 W which is still on the "Hot" side I guess.
I kept everything I took out of this amp, so if you wanted this amp to be in the "original" valuable "nonworking" state you could put it all back in and just look at your broken amp stood in the corner.
I on the other hand am not the slightest bit interested in the value I would rather it worked.