simple se ground to speaker wire?

pforeman · 25th July 2009, 09:38 PM

Just about ready to finish the box. Not a metal case.
If I read Georges site correctly, when I'm hooking up the grounds, I also ground each speaker connector, either black or red. So am I connecting my speaker wire to the ground? Somehow this doesn't sound correct.
Thanks,
Paul

Sheldon · 26th July 2009, 12:36 AM

Quote:

Originally posted by pforeman
Just about ready to finish the box. Not a metal case.
If I read Georges site correctly, when I'm hooking up the grounds, I also ground each speaker connector, either black or red. So am I connecting my speaker wire to the ground? Somehow this doesn't sound correct.
Thanks,
Paul

With a amp that uses no feedback from the output of the transformer, grounding one side of the output is not strictly necessary. The output can be left floating. Grounding one side or the other of the output does provide protection against an internal failure of the primary/secondary insulation, and some recommend grounding for that reason.

Technically, it doesn't matter which side you ground, as it doesn't affect the phase or output. However, in an amp using feedback, which side is grounded does matter, as the phase of the feedback must be correct. Just for consistency's sake, it's best to always use the black connector for the negative pole, and ground it.

Sheldon

rknize · 26th July 2009, 04:24 AM

Just to add to that, if you are using cathode feedback on the Simple SE, you may have to swap the secondary wires on the OPT. The feedback is supposed to be negative, so you actually need to connect the "positive" side of the secondary to the cathode to get negative feedback. You end up with the speaker + on the black wire of the secondary.

pforeman · 27th July 2009, 12:44 PM

Thanks for your help.
Someone else in a different thread also gave this advice about cathode feedback and switching the secondary outputs.
If I follow Georges diagrams on wiring the switch, will it switch the outputs, or do I have to manually do it when I want to switch in or out cathode feedback?
Thanks again,
Paul

rknize · 27th July 2009, 01:13 PM

His diagrams make the swap, but read the accompanying text as well for caveats.

25th July 2009, 09:38 PM	#1
pforeman diyAudio Member Join Date: Aug 2008	simple se ground to speaker wire? Just about ready to finish the box. Not a metal case. If I read Georges site correctly, when I'm hooking up the grounds, I also ground each speaker connector, either black or red. So am I connecting my speaker wire to the ground? Somehow this doesn't sound correct. Thanks, Paul

26th July 2009, 04:24 AM	#3
rknize diyAudio Member Join Date: Feb 2009 Location: Chicagoland	Just to add to that, if you are using cathode feedback on the Simple SE, you may have to swap the secondary wires on the OPT. The feedback is supposed to be negative, so you actually need to connect the "positive" side of the secondary to the cathode to get negative feedback. You end up with the speaker + on the black wire of the secondary. __________________ Russ http://www.knizefamily.net/russ/cate...ics/tubeaudio/

27th July 2009, 01:13 PM	#5
rknize diyAudio Member Join Date: Feb 2009 Location: Chicagoland	His diagrams make the swap, but read the accompanying text as well for caveats. __________________ Russ http://www.knizefamily.net/russ/cate...ics/tubeaudio/

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27th July 2009, 12:44 PM	#4
pforeman diyAudio Member Join Date: Aug 2008	Thanks for your help. Someone else in a different thread also gave this advice about cathode feedback and switching the secondary outputs. If I follow Georges diagrams on wiring the switch, will it switch the outputs, or do I have to manually do it when I want to switch in or out cathode feedback? Thanks again, Paul

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