I have a BA-3 FE and I do like the sound. Perusing literature about it, I came across the Audio Society of Minnesota (ASM) article about the BA-3 as a preamp here Audio Society of Minnesota - Pass BA-3 Preamplifier
In the article, I read the following
We cut two traces to eliminate ground loop paths on the boards and added a lead to terminate at our chassis star ground. This is not the fault of the design, but these alterations are suggested for use in a single ended application.
I do not have a hum using the preamp driving my M2X, F4, Dynaco, and AKSA amps. I have a little hum when I use my 2A3 and 300B amps. I had been examining the board but I got nothing. I would like to learn which traces on the BA-3 board the article is referring to. Anyone can point me to which traces are those in the board?
Thanks for your help!
In the article, I read the following
We cut two traces to eliminate ground loop paths on the boards and added a lead to terminate at our chassis star ground. This is not the fault of the design, but these alterations are suggested for use in a single ended application.
I do not have a hum using the preamp driving my M2X, F4, Dynaco, and AKSA amps. I have a little hum when I use my 2A3 and 300B amps. I had been examining the board but I got nothing. I would like to learn which traces on the BA-3 board the article is referring to. Anyone can point me to which traces are those in the board?
Thanks for your help!