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Old 5th June 2012, 11:24 AM   #1
rock12 is offline rock12  United States
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Default heathkit SA2

I just aquired a heathkit sa2 and in looking at the schematic I only see one spot that is grounded. Being sort off new at this I have not seen this before can someone explain?
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Old 5th June 2012, 12:07 PM   #2
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The ground on the input jacks likely signifies the chassis ground. The circuit will be connected to the chassis at only one point,near the input jacks. This is to control ground currents that may make noise,etc.

If you really want to know about the finer points of grounding,check out some of the various (looong) threads on here.
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Old 5th June 2012, 04:31 PM   #3
kevinkr is offline kevinkr  United States
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SA2 fixed up is a one of the better sounding vintage pre-amps I have heard, definitely worth the trouble.
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
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Old 5th June 2012, 06:35 PM   #4
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I have a Heathkit W7M (it has only one ground point) and this is what the construction manual says.
When wired according to instructions, there is only one ground connection to the amplifier. Any other point of contact between chassis and ground wiring will result in a “ground loop”. And will definitely raise the hum level of the amplifier.
Through experience I found this statement to be true.
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Old 6th June 2012, 10:53 AM   #5
rock12 is offline rock12  United States
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thank you for all the feedback
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