VOX AC30/6 Repair

[Backtoreality]

Originally Posted by stevehertz

Yes, Servisol Super 10 is the industry standard and is unlikely to cause a problem no matter where it goes. Best of luck.

That certainly seems to have cured the pot!
I've now received 4 x 6P14P Soviet valves from Ukraine. They are sold as used, matched EL84 equivalents.
I've put them in the amp and tested it with my electric guitar. I think they sound brighter and fuller than my Chinese ones, with a hint of spice and blackberry.🤣
I do wonder about the hiss and buzz the amp is producing despite all of the electrolytics being replaced (when the volume is increased) it's silent when the volume is down.
Regards,
David

[vidjoman]

The front end ECC83’s need to be low noise as they are used as a very high gain stage and that’s why you will get a lot of noise. Also a contributor can be the cable from the guitar as well as the guitar itself because many are not screened around the controls. When played at a gig the noise won’t usually cause a problem.

[Backtoreality]

Yes I noticed the noise was much worse when I was sitting next to the amp. When I move over to the other side of the room it reduced significantly.

[stevehertz]

Originally Posted by Backtoreality

Yes I noticed the noise was much worse when I was sitting next to the amp. When I move over to the other side of the room it reduced significantly.

Well known amongst guitarists, especially when using single coil (non-humbucking) pickups. To check, just unplug the guitar (and lead) and check the noise levels. It may also be picking up noise from SMPSs. To check that, take the amp outside and use a mains extension lead. You'll probably find that all told it's quite quiet, the 'noise' being due to various sources of such.