Like I said old picture and it was back when I had another thread where I pretty much tried everything.
I'm under the impression that these amps are not prone to electromagnetic noise (noise pickup from magnetic fields, like transformers) - so I really doubt wiring layout/gauge is your problem. I'd guess your problem is your grounding scheme. What are CHG, PG+ and PG- connected to?
I would connect CHG and the chassis to the power input connector ground directly.
Try connecting your source to the amp with a different cable. I had subtle noise issues that resolved when I got rid of my rat shack interconnect.
Also, is your transformer true dual secondaries (has four wires not three)?
I would connect CHG and the chassis to the power input connector ground directly.
Try connecting your source to the amp with a different cable. I had subtle noise issues that resolved when I got rid of my rat shack interconnect.
Also, is your transformer true dual secondaries (has four wires not three)?
also, wrt 'danielwritesbac' - the resistor he suggests adding is already there - it is one of the 22k resistors. R2?
the board pic makes it hard to see
the board pic makes it hard to see
Well I did the grounding scheme just like that thread said. I used a nice thick wire from the wall outlet ground to a star point and then used thinner wire from the 4 connections on the rectifier board and then the thinnest wire used for the inputs. So I had a star ground scheme. Anyways the noise is like completely gone no hum at all. There is a bit of static sound but I can only hear it if I put my ear up to the speakers. Also my speakers are quite sensitive something like 95dB. Sounds excellent now though very happy 🙂
- Status
- Not open for further replies.