I use two Carvin 50 watt EL84 amps (a VT50 head and a Nomad 1x12, totally identical chassis and schematic, same amp) to get stereo sound from a smallish pedal board in my home. I noticed a lack of stereo effect this morning and sure enough, the combo amp is making a faint 60hz hum and I’m getting zero output whether slaved or through the preamp. Fuse is good. Visually both amps have 4 glowing power tubes and preamp tube 1 glows while 2-4 do not, so the bad amp and good amp seem to be heating the filaments the same. What now? I can handle pulling the chassis and safely draining the caps. I’m an electrician so I’m fully aware of safety and would use a resistor setup to drain them without incident.
Most likely, if it’s a “bad tube” (open circuit) I can handle replacing and re-biasing. If it’s the PT or OT, the amp will probably get sold as is for parts/to be repaired by someone with cash to play and time to dump.
Any suggestion? Party on.
Most likely, if it’s a “bad tube” (open circuit) I can handle replacing and re-biasing. If it’s the PT or OT, the amp will probably get sold as is for parts/to be repaired by someone with cash to play and time to dump.
Any suggestion? Party on.