120V to 220V higher readings, 2nd problem noticeable hum both channels

[Jimb0]

Thank you Paul. I will look to get one

[Jimb0]

I was able to test it on the step-up transformer and everything checked out fine. Thanks for the help as always Paul!

[Jimb0]

Hi Paul. I did not do a listening test on the 220v until now. I'm getting a hum on both channels. I was not getting a hum on the 120v configuration. Any thoughts why this is happening?

[Paul Birkeland]

What are you using for a step-up device? What are you using for a source?

[Jimb0]

I'm using a Seyas 120v to 220v 500w step up converter. Source is a Schiit Modi Multibit hooked up to my desktop

[Paul Birkeland]

Try using your phone with a 1/8" to RCA cable as the source to see if the hum goes away.

[Jimb0]

tested it on my phone but still having the same issue

[Jimb0]

I also want to mention that I went ahead and rewired it back to 120v a few hours ago and tested it with my headphones. I was getting a hum as well.

[Paul Birkeland]

Are the voltages still OK?  Is the hum in both channels?

[Jimb0]

Rechecked the voltages, everything seems okay. Could it just be a cold solder joint? I'm resoldering any suspect joints right now

[Jimb0]

Rechecked it after resoldering the joints. Still getting the hum. The hum increases when I raise the volume as well. It is in both channels.

[Paul Birkeland]

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

[Jimb0]

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.

[Paul Birkeland]

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. 

[Jimb0]

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?