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gruveb · May 12th, 2010, 11:17 PM

I was looking at my 73 Twin Reverb and saw the ground switch. It has A, off, B...I have no idea where it should be and why. Can anybody advise me on this?

backline · May 13th, 2010, 10:10 AM

I do not remember those having an OFF position. Does your amp have a 3 wire power cord? It is quite possible, at this point, your "ground" switch does not even function. Regadless......leave it in the position you think sounds best, and that may change when you move the amp to a new location. Can you take some pictures of the guts?
Good Luck

gruveb · May 13th, 2010, 06:02 PM

I can take a pic. It does have a three prong chord on it.

JohnS · May 13th, 2010, 07:32 PM

It matters most when you have several amps and / or PA on stage. The ground switch lets you change polarity and stop any shocking you might be getting (like from a mic on your lip.) By yourself it sometimes can reduce hum if you have any.

May 12th, 2010, 11:17 PM	#1 (permalink)
gruveb Tele-Meister Join Date: Apr 2008 Location: Rio Rico, Arizona Posts: 205	Ground Switch, Twin Reverb I was looking at my 73 Twin Reverb and saw the ground switch. It has A, off, B...I have no idea where it should be and why. Can anybody advise me on this?

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May 13th, 2010, 10:10 AM	#2 (permalink)
backline Tele-Holic Join Date: Oct 2008 Location: USA, CA, 94585 Age: 52 Posts: 953	I do not remember those having an OFF position. Does your amp have a 3 wire power cord? It is quite possible, at this point, your "ground" switch does not even function. Regadless......leave it in the position you think sounds best, and that may change when you move the amp to a new location. Can you take some pictures of the guts? Good Luck

May 13th, 2010, 06:02 PM	#3 (permalink)
gruveb Tele-Meister Join Date: Apr 2008 Location: Rio Rico, Arizona Posts: 205	I can take a pic. It does have a three prong chord on it.

May 13th, 2010, 07:32 PM	#4 (permalink)
JohnS Tele-Afflicted Join Date: Mar 2003 Location: San Jose, CA Age: 63 Posts: 1,540 73 Photos	It matters most when you have several amps and / or PA on stage. The ground switch lets you change polarity and stop any shocking you might be getting (like from a mic on your lip.) By yourself it sometimes can reduce hum if you have any.

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