The Amp Garage

If both sides of the primary show 119V and the primary tests with a low resistance, then neutral is not getting to the PT primary while line voltage is. If it was me, I would - unplug the line cord - unsolder the primary leads of the PT; this prevents the low-ohms primary from messing with continui...

If both sides of the primary show 119V and the primary tests with a low resistance, then neutral is not getting to the PT primary while line voltage is. If it was me, I would - unplug the line cord - unsolder the primary leads of the PT; this prevents the low-ohms primary from messing with continui...

Don't connect your meter to chassis ground when checking voltage on the primary side of the PT. Doing so will give you false readings that don't make sense. Instead, connect the meter black lead to the power cord white (neutral) wire. Then use the red meter lead to trace voltage from the power cord...

It's hard to get those results with neutral connected to the primary. Track down the neutral connections. Fender Twin 135 Layout.png Thanks for the suggestion. It's wired just like that and traces fine, just without the death cap on the ground switch. I assume that was snipped when the power cord w...

A confirmation test after that would be to unhook the high voltage secondary side of the PT and clip lead in wall voltage and then see if any AC shows up on the primary side. Clip into the full HV or use the center tap? Thanks for the other info. Edit: With the amp unplugged I'm getting continuity ...

I took a friend's 135w Twin Reverb home that was having some issues that were never really sorted out from a previous tour. I can't remember the model number. The one with the pull boost on the master volume and hum balance pot on the back. One of the power tubes had fallen out and he never got it w...