I’m installing a new output transformer into Tim Lerch’s Princeton Reverb re-issue. The new output transformer is an Allen/Heyboer “TO-20.” It’s a much beefier part compared to the stock OT (see photos below, new OT is black, stock is silver)). I also installed a larger-valued power supply filter capacitor for the main supply voltage.

As a result, the amplifier holds together a bit better at higher volumes. Plus, I think the new OT makes the amp a bit more articulate.

Let’s see what Tim thinks……

“Paul. I really think it’s a lot better. More robust and the low mids seem more prominent than before. A good upgrade!”