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TEMPORARILY lifted the green wire from chassis [message #40475 is a reply to message #40474]

Sat, 01 March 2003 20:08

Sam P.
Messages: 307
Registered: May 2009

Grand Master

and hum voltage measured at the outputs dropped dramatically. I think it might be asking for loop problems, sticking a chassis that is earth grounded, into the signal chain where the preceding and following units are 2 wire/isolated. If it is quieter in the system, I'll try RECONNECTING the earth ground, and look into "floating" the neg. end of the B+ supply filter caps and signal grounds from the chassis. The marchand isolates all signal and power grounds from the chassis, and connects the p/s ground to earth via a resistor, FWIW.
BTW, at the outlet my ac line neutral and earth ground have about 0.3vRMS differential...is that "normal"?! Sam

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[Message index]

		tube active xover update By: Sam P. on Sat, 01 March 2003 12:27
		Re: tube active xover update By: Wayne Parham on Sat, 01 March 2003 12:46
		do "bottle heads" use 3 wire power cords? By: Sam P. on Sat, 01 March 2003 13:21
		Ground loops By: Wayne Parham on Sat, 01 March 2003 18:40
		TEMPORARILY lifted the green wire from chassis By: Sam P. on Sat, 01 March 2003 20:08
		You found it! By: Wayne Parham on Sat, 01 March 2003 21:04
		heater-cathode hum? By: Sam P. on Sun, 02 March 2003 16:21

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