SA-3A (LA-3A Clone) Support Thread

Help Support GroupDIY:


Well-known member
Feb 5, 2014
Brooklyn, NY
Sliding some braided shielding cable over the power link wire did it for me without having to ground it or anything. I guess it creates enough of a faraday cage to stop radiated E-fields. It actually made no difference if I grounded it or not, and I secured heatshrink over the ends to make sure it couldn't short out on either side of the cable. I also had to cable-tie the assembly against a nearby cable to make sure the shield was squished down tight against the wiring to get rid of every last bit of hum, which is why I recommend using proper 3-4 conductor shielded cabling. Gotham 85225 cable would be luxurious, but you could also probably do with Mogami W2893 since the SA3A doesn't draw much current

This is what I used for shielding FYI:

Hopefully can post some pix soon!


New Member
Mar 26, 2021

While assembling a stereo unit for a friend I revisited and re-calibrated my two units (from a long time ago)

One of the channels has developed a little problem which I think I've narrowed down to a problem in the output gain.

(MOD, 50dB, Compress)
Feeding a -18dBFS signal into it I get one side to Gain +/-6 for a 0dB(VU) reading while I need the other side to be at 7. Around 6 the signal gets distorted (while reading about -2.7dB(VU)).
When I turn up the peak reduction the volume lowers (obviously) and the distortion goes away.
When I compensate for the lost volume the distortion returns at the same VU reading.

Looking at the schematic logic tells me to try and replace Q3, Q4, Q5 and/or Q6 to see if the problem goes away or am I wrong here?

Thanks in advance,
did you ever fix this? i have a similar issue