heathkit SA2

rock12 · 5th June 2012, 11:24 AM

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?

DigitalJunkie · 5th June 2012, 12:07 PM

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.

kevinkr · 5th June 2012, 04:31 PM

SA2 fixed up is a one of the better sounding vintage pre-amps I have heard, definitely worth the trouble.

harosenthal · 5th June 2012, 06:35 PM

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.

rock12 · 6th June 2012, 10:53 AM

thank you for all the feedback

5th June 2012, 11:24 AM	#1
rock12 diyAudio Member Join Date: Nov 2010 Location: midland mi	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?

5th June 2012, 04:31 PM	#3
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	SA2 fixed up is a one of the better sounding vintage pre-amps I have heard, definitely worth the trouble. __________________ "Extraordinary claims require extraordinary evidence." - Carl Sagan

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5th June 2012, 12:07 PM	#2
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	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.

5th June 2012, 06:35 PM	#4
harosenthal diyAudio Member Join Date: Jun 2004 Location: San Diego, California	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.

6th June 2012, 10:53 AM	#5
rock12 diyAudio Member Join Date: Nov 2010 Location: midland mi	thank you for all the feedback