Re: Hum problem solved

OTL Asylum

OTL, Output Transformerless Amplifier User Group.

In Reply to: Hum problem solved posted by JFP on February 19, 2006 at 15:54:56:

JFP,
By installing the shorting plug in the 2-3 position, you tied the RCA jack to both the inverting and non-inverting inputs in the amp. This would effectively prevent the amp from amplifing any signal on the cable. Obviously, no harm done.
Have you swapped the interconencts left & right, at the power amps? Does the hum switch channels?
Have you considered plugging the amps back into the original 15A circuit to see if they are still quiet? The new circuit might be a red herring, but trying them again on the old one should put that possibility to rest. It's still sounding like a ground loop to me, and the fact that both amps are quiet with cables disconnected (on the new circuit) tends to reinforce that idea.
I'll be at the shop later today, if you'd like to call and discuss the issue further.
-Bill

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Follow Ups Full Thread

Topic - Hum problem solved - JFP 15:54:56 02/19/06 (5)

It ain't the tubes ! You have a ground loop with the new circuit - eds65gto 11:53:34 02/20/06 (0)

Re: Hum problem solved - Legendre 07:25:57 02/20/06 (1)

Re: Hum problem solved - JFP 12:43:25 02/20/06 (0)

Re: Hum problem not solved - JFP 16:07:42 02/19/06 (1)

Re: Hum problem not solved - JFP 01:39:07 02/20/06 (0)

Follow Ups

Re: Hum problem solved - Legendre 07:25:57 02/20/06 (1)

Re: Hum problem solved - JFP 12:43:25 02/20/06 (0)

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