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Post subject: Princeton Ground Switch
Posted: Thu Mar 13, 2008 1:35 pm
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Heres an easy one for all u amp experts. Exactly what does the three position ground switch do on the back of a 70's Princeton. I am amp challenged and have been learning a great deal about it here on this site. Thanks in advance for any answers.


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Posted: Fri Apr 04, 2008 12:21 pm
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':idea:' I'm just learning about amplifier construction and I see that on the schematic, the grounding switch appears to take the hot and neutral incoming lines and allows you to reverse them. I believe that the idea dates back to the days when two-prong supply cords had one prong that was broader, forcing the user to plug the electrical device in one way only. I know that I often use the switch when I go into homes where the wiring is a bit dodgy or assembled by a well meaning non-electrician. Anyway, the net result is that what might be a buzzy amp gets quieter because of the amp is being switched to accommodate the wiring of the receptacle. (Please correct me if I am wrong).


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Posted: Fri Apr 04, 2008 12:31 pm
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Last edited by tinker tech on Wed Jul 29, 2009 10:00 am, edited 1 time in total.

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Posted: Mon Apr 07, 2008 6:10 am
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It's a polarity switch from the 2 prong plug days. I had many of them way back. I would have a tech change it to a 3 prong setup asap. I have been shocked on many occasions from the 2 prong polarity switch setup. The problem is you may think you have it right, but maybe your PA system or another guitarist is different. You need to be sure that no voltage is passing between you or another piece of equipment. Given the right (or wrong) conditions it could be fatal.


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