Guitar Amp Tube
June 20th, 2011 | 
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building a tube guitar amp. there are several diff ground symbols. are they all supposed to be connected?
I am building a tube guitar amp. there are several diff ground symbols on the schematic. are they all supposed to be connected? I have the ground from the power cord attached to the chassis. Can other grounds in the schematic be attached to the same chassis ground?
here is a link to the schematic: http://ax84.com/media/ax84_m175.pdf
is the signal ground connected to the chassis at all?
If you are using a power transformer, then the chassis should be isolated from the other grounds. There should only be a chassis ground and a separate signal ground which is the same as all the B- supply voltages.
The only other ground I can think of is the speaker ground, returning to the output transformer. That can either be separate, or connected to the signal ground -- it doesn't matter (unless you've got some really bizarre tube circuit).
If you e-mail me the schematic or send a link to it, I can check for sure.
.
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