Dandy
Addicted Member
Please can someone tell me how to connect two mono tube amps to a preamp and avoid a ground loop? I'm trying to use two Mullard 5-20s for stereo with stereo tube preamp.
I followed these build directions carefully and each one is silent when operating in mono: http://www.r-type.org/articles/art-003d.htm The problem is when connected to one another there is a ground hum that I can't eliminate.
I think the Eico HF22 use the same circuit, so I'm sure this is a problem that that others have cracked.
The preamp works without hum on other stereo power amps, such as a Dynaco ST70.
Thanks for any help.
I followed these build directions carefully and each one is silent when operating in mono: http://www.r-type.org/articles/art-003d.htm The problem is when connected to one another there is a ground hum that I can't eliminate.
I think the Eico HF22 use the same circuit, so I'm sure this is a problem that that others have cracked.
The preamp works without hum on other stereo power amps, such as a Dynaco ST70.
Thanks for any help.