![]() This means more feedback is applied in the Princeton, which is one of the reasons it runs cleaner. Schematics show the Princeton Reverb has a 2K7 feedback resistor, but the 5F11 Vibrolux and brownface Princeton have a 56k resistor. ![]() You could also drill an extra switch hole in the back panel if you want to retain the external speaker option. ![]() Wired this way, the feedback circuit is stock when the control is fully clockwise, and feedback is disabled with the control fully anticlockwiseĪlternatively, you can remove the extension speaker jack if it’s a feature you wouldn’t use and put a toggle switch in its place. Replacing one of the control pots with a push/pull or push/push pot would allow you to switch the negative feedback from the front panel. If you decide you like it, but you want to retain the option, you should consider a negative feedback switch. If you don’t, simply re-solder the green wire to the external speaker socket and skip to the next mod. Have a listen and see if you like the tone without negative feedback. Start by de-soldering the green wire from the positive terminal of the external speaker jack and covering the exposed wire with some insulation tape to prevent it from shorting out. ![]() Removing or modifying the negative feedback is one of the easiest mods you can make to an amplifier, and the best thing is that it generally costs nothing and is easily reversed. We used a matching feedback control knob using existing and unwanted holes is easier than drilling new ones ![]()
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