[KettyKrueger]

Hi all,
 
Not sure what the problem is here, could one of the tubes be bad/dying?
 
I've done a fair bit of troubleshooting and it's definitely the amp.
 
As a side note, does the MKIII need biasing when the tubes are changed?
 
Any help is appreciated.
 
Thanks.

 

[Brooko]

Could be a tube on the way out.  Try swapping the two driver tubes first (left to right and right to left), and see if the channel imbalance switches sides.  Then do the same with the power tubes.  If you can isolate it - then you'll at least know which ones need replacing.

 

[KettyKrueger]

Thanks for that.

How do I take the tubes out? Do I need to rebias them after?

 

[KettyKrueger]

Nevermind. Just realised I had the gain switches set incorrectly!