Try using your phone with a 1/8" to RCA cable as the source to see if the hum goes away.
120V to 220V higher readings, 2nd problem noticeable hum both channels
- Thread starter Jimb0
- Start date
Are the voltages still OK? Is the hum in both channels?
If you have no hum with the pot all the way down, but hum with the pot all the way up, I would be looking at the grounding wires around your RCA jacks, and ultimately I would check on the grounding connections from the IEC power entry module.
Ultimately you could simply have a wire that has broken in the process of rewiring the power transformer.
-PB
Ultimately you could simply have a wire that has broken in the process of rewiring the power transformer.
-PB
PB,
The hum is there as soon as I turn on the amp. It then gets louder when the headphones receive the signal from the amp.
Resoldered all the grounding wires on the RCA jacks, even tried replacing the wire from the IEC power entry to terminal 13 on the transformer.
There's a hum even with nothing plugged into the RCA, it's immediate as soon as I turn the amp on.
The hum is there as soon as I turn on the amp. It then gets louder when the headphones receive the signal from the amp.
Resoldered all the grounding wires on the RCA jacks, even tried replacing the wire from the IEC power entry to terminal 13 on the transformer.
There's a hum even with nothing plugged into the RCA, it's immediate as soon as I turn the amp on.
You definitely have a loose wire, broken wire, or something not well connected. If it's there right when the amp is on, then I would suspect some kind of issue around the H terminals as a strong possibility.
Paul,
I carefully inspected and resoldered almost every wire on the amp, paying close attention to the ones on the IEC power entry module and H terminals and I'm still getting noise. Is it possible there is another reason for the buzz, possibly one of the tubes has gone bad? I remember having a similar issue with a Crack when I was removing and reinserting the tubes several times. Could this be it? Is there anyway to test it?
I carefully inspected and resoldered almost every wire on the amp, paying close attention to the ones on the IEC power entry module and H terminals and I'm still getting noise. Is it possible there is another reason for the buzz, possibly one of the tubes has gone bad? I remember having a similar issue with a Crack when I was removing and reinserting the tubes several times. Could this be it? Is there anyway to test it?
One of the tubes won't make both channels hum. You could also double check the resistance checks to see if anything looks odd there. You could also get hum if a power supply cap became disconnected, but in order for that to happen in both channels, you would also see improper B+ voltage.
