After replacing the Princeton's filter caps, we continued on to the cathode bypass caps, the two brown capacitors seen here.

Each is a 25 MF, 25 V, paper electrolytic capacitor.

The capacitor seen on the left diverts AC signal around the power tube's cathode-bias resistor.  The resistor, a 470Ω, 1W part, can be seen alongside the capacitor in this photo.

The capacitor on the right bypasses the cathode-bias resistor in the gain stage of the preamp.  The resistor, a 1.5kΩ, ½W part, is alongside the capacitor.

SCHEMATIC - FENDER PRINCETON 5F2-A

Here, we've removed the bypass capacitors in the same way that we removed the filter caps.  In this case, only one lead serves as a hidden jumper under the board.

Notice that we also removed the 470Ω, 1W cathode resistor.  It tested 422Ω, ten percent low, and also looked a bit blackish (see the previous photo).

This one watt resistor sets the bias of the 6V6 power tube.  It gets pretty warm during use and deserved replacement.

Here you see two newly installed cathode-bypass caps and one newly installed 470Ω, 1W cathode resistor.

Here's the finished preamp section of the Princeton 5F2-A.

We decided to keep the two mustard colored, stage-coupling caps after making sure they weren't leaking any DC current.  The current would show up as positive DC voltage on the grid of the receiving tube.

These hard, epoxy-coated mustard caps are very reliable.

Here's the whole Princeton eyelet board, with all the electrolytic caps replaced.

This recap job restored lost life and tone to the Fender Princeton amp.

The plate voltage in the amp's gain stage went up by 10VDC.  In the driver stage, it went up by 15VDC.

We also had the amp's original speaker re-coned, since it was making fizzy noises at low volumes.

In this Princeton 5F2-A, Fender used an 8-inch, 4-ohm Oxford 8EV speaker.