PV Classic 30 Pre Heaters Dead

[Pryde]

Hello

I have a PV Classic 30 on the bench with dead preamp tube heaters. I am getting no voltage to the filament pins. The power tube heaters were also dead but found a broken jumper connecting FIL1 on the schematic and the EL84s are now glowing but all 3 preamps are not.

I suspect I have another bad jumper to replace somewhere but can't figure out where the preamp heater voltages (FIL A and FIL B on preamp heater pins) originate from? They are not listed on the schematic that I can see.

Any help/insight is appreciated.
Schematic is attached.

[g1]

V3b gets the -36V, V1A has the ground, the rest of the filaments are in series between those.

[Pryde]

Ah now I see. thanks for clarifying. Going to start tracking now

[Pryde]

Seeing 1.8vAC on V3 pin 5. No -36v per the schematic

Confused by how these filaments are wired really:
V3A pin 4 and V2B pin 5 are marked "FIL A"
V2A pin 4 and V1B pin 5 are marked "FIL B"
V1A pin 4 is marked with a series symbol?
V3B pin 5 marked with -36v

So which pins should be seeing voltage and how much?

[Pryde]

OK new problem. This thing is making me nuts. Found another broken jumper and replaced it. Got the preamp tubes lighting. Then R67 burns up???

it is a 180R resistor feeding -30v somewhere. Any ideas?

This thing is making me crazy

[Pryde]

Never mind. Bad reverb opamp causing R67 to cook. Replaced both and good to go.

Terrible amps to work on. Why would you ever fold up a circuit board and put 200 jumpers on it when there is plenty of room in the chassis to lay it out flat

[Amp Kat]

Make sure your jumper connection is clean and didn't jump over to another component or wire. The only other thing that would cause that is a short somewhere maybe in the -15 volt circuit but there really isn't enough current in that circuit to fry that resistor so check that jumper good.