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Need Help Trouble shooting

I Have a hum coming from my right speaker
I tried swapping speaker leads and the hum moves to the other speaker
i'm thinking it's a tube and i'ts my amp that is the issue
If it is a tube not sure if it's the output or input tubes I should be looking at
The pre when in operate mode without Amps on the hum is gone

Help me trouble shoot further
musicfile
joeylawn36111
574 posts
 
swap those tubes (one channel at a time) also.
tvad
9,467 posts
 
Swap the pre>amp ICs and listen for the hum to follow (or not). If it follows, then it's either the preamp or the source, and you then need to restore the pre>amp ICs and swap the source>pre ICs. If the hum follows the source>pre IC swap, then it's the source.

If you determine it's the amp, then as Joeylawn36111 says, you need to swap pairs of tubes L>R one pair at a time, restoring each swap if the hum does not follow, and repeating the process until the hum follows the swap.
dopogue
1,767 posts
 
It could be a defective cable. Happened to me on several occasions. Try another pair. Good luck, Dave
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