speaker grounding

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Leevi
Junior tube assistant
Posts: 101
(2/14/04 4:01 pm)
 speaker grounding
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 Are the speaker(s) normally grounded to the chassis in combo amps? Do you recommend the grounding?
/Leevi
 
GroundhogKen
Forum Moderator
Posts: 2266
(2/14/04 8:36 pm)
 Re: speaker grounding
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 One leg of the output transformer secondary must be grounded.

If it's not grounded, the negative feedback won't work properly and there will be buzz or hum.

Also, I would think that an ungrounded secondary could possibly drift up to the B+ level, so even if an amp doesn't have negative feedback or presence, you should ground the secondary.

The speaker frame does not need to be grounded.

Ken
 
Leevi
Junior tube assistant
Posts: 102
(2/15/04 2:50 am)
 Re: speaker grounding
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 Actually my question was related to grounding of the speaker frame to which I got an answer, thank you Ken. I remember one case where I succeeded to eliminate an oscillation by grounding the speaker frame. Maybe the source for the problem was somewhere else but speaker frame grounding solved it.
/Leevi
 
Tiny Daddy
I will work on all amps
Posts: 491
(2/15/04 10:00 am)
 Re: speaker grounding
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 This kind of oscillation problem turns up other ways too:
Ungrounded heat sinks, unused floating conductors or any floating copper on PC boards. Electrical noise can also be conducted back to sensitive circuits.
But it's not the usual to have to ground speaker frames.
 
 
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