[rille2]

I have a defective SRM-323A. The transformer is defective. Can anyone measure the voltages at the secondary side of the transformer? I want to order a custom transformer for replacement and need the exact voltages.

 

[DouglasQuaid]

I have a 313 I could check, but I am uncertain if they contain the same power supply.

 

[rille2]

I don't know if it would help. The problem is the BIAS. It is unregulated and wouldn't have the correct value if the voltage is too high or too low.

 

[rille2]

In the meantime I could repair the amp. I ordered a transformer with 2x240V and 1x9V for the LED.

 

[djonny]

My SRM-323A have strange voltages on transformer secondary: orange - 270V, red - 290V, blue - 6V. I think voltages on orange and red wires must be equal?

 

[kevin gilmore]

A number of different stax models over the years have a higher negative voltage than the corresponding positive voltage.
Measured at the capacitors the positive voltage should be around 375, and the negative voltage around 400.

 

[zzhetanay]

great work