Reference Photos
last update May 10

modifications page

Here are some photos of Princeton Reverb IIs which may help you with a project or troubleshooting. The schematic, parts list and wiring diagram are here.

I have begged, borrowed or stolen these photos of the Princeton Reverb II over several years, If you see your photo here and would like credit OR the removal of the photo, please email me and I'll do as you ask.

This is a US (110V)  PRII.... 220v owners, see the other photos
In this photo, the rear panel components are (left to right); hum balance, reverb input, reverb output, pedal red, pedal (plain), line/recording, speaker out, ground switch, courtesy outlet, fuse, power cable entry.
The sockets are (left to right) v1,2,3,4,5,6,cap can.

in the photo above note the 'ground switch' and, to the left of that, the "courtesy outlet". These do not appear on the 220V models.




220V model shown below...

above - 220V model with the valves (tubes) in place. Valves are (left to right) v1,2,3,4 with metal covers in place, v5 and v6. Transformers are (left to right) reverb transformer, output transformer, choke, and power transformer. The cap can is extreme right.



below - same 220V model, interior
note (1) at the top right-hand corner of the circuit board there's a new, grey rectangular 47 ohm bias feed resistor (2) down from that, there's an extra resistor in parallel with the original resistor to'cool' the power valve bias (3) both power valve sockets have grey rectangular 470 ohm screen-grid resistors (not present in unmodified amps) (4) the purple capacitors on the left-hand side (input side) are non-original. Any other differences in component colours (compared to the 110V circuit board) are coincidental and not because of the 110V/220V difference. 





below- same 220V model, input end; note (1) at the top right-hand corner of the circuit board there's a new, grey rectangular 47 ohm bias feed resistor (2) down from that, there's an extra resistor in parallel with the original resistor to'cool' the power valve bias (3) both power valve sockets have grey rectangular 470 ohm screen-grid resistors (not present in unmodified amps) (4) the purple capacitors on the left-hand side (input side) are non-original. 


above - 220V model, input end



below- same 220V model, output end; US owners, in this photo you can see the rectangular blank where the courtesy outlet should be on your amp's rear panel. See the photo at the top of this page for a 110V model with the courtesy outlet and ground switch.



above- 220V model, output end - note (1) at the top right-hand corner of the circuit board there's a new, grey rectangular 47 ohm bias feed resistor (2) down from that, there's an extra resistor in parallel with the original resistor to'cool' the power valve bias (3) both power valve sockets have grey rectangular 470 ohm screen-grid resistors (not present in unmodified amps).

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