Just received my WA33 yesterday. It’s a used model that I was told works perfectly.
It hums like crazy, video available here: https://photos.app.goo.gl/GhybDDYwDcb78aeD8
I know tube amps are much more susceptible to the environment and such but was wondering what would be the best way to troubleshoot the source?
I’m so sorry! I’d try this out and if you can’t get it to stop, reach out to woo. This is from the site.
22: What to do when my amplifier developed a light hum/noise?
Noises can come from many different places. e.g. power source, audio cables, environmental EMI. To test, please try the following.
disconnect all cables from the amplifier.
install ALL stock tubes.
move amplifier to another area of the house. e.g. living room, kitchen countertop, office, etc. (This is important to isolate the amplifier from other components).
keep cell phones, WiFi routers, powered hard drives and other high EMI devices away from the amplifier.
connect AC power cord directly to a wall outlet (no conditioners or power strips).
connect headphones to the amplifier and set volume to 11 o’clock position.
listen through headphone. Do you still hear the hum?
If you still hear the hum, try a ground-lift adapter (for testing ONLY). If the hum goes away using the adapter, you have a ground-loop issue in the house. You can use a device called HUM-X.
Does the wa33 use torodal power transformers? Cause if so those will hum like that when there is a dc offset