Playing last night, loud and there was a loss of volume almost like a rolling off the volume then a rolling back up again, first time I've had any issues with it and gets played loud pretty much weekly.
Having looked I found an old thread on here saying it was probably the preamp valve or socket connection, and not being overly keen on wielding a soldering iron thought it best to start with replacement valves, they are the original ones in there now so regardless a change of valve will be a good thing so not necessarily a waste of money.
Best place or recommendation for buying replacement valves online?
Also is it absolutely necessary to check the bias?
Cheers all
Comments
It's not absolutely necessary to check the bias if you're replacing the power valves (not preamps) but it is a good idea - it's easy in these if you have a multimeter.
It's arguably more important to reset the voltage connection from 230V to 240V if it hasn't already been done, which is also straightforward once you've got the back off.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Cheers
The voltage change is simply reconnecting the white/black-stripe wire on P4 and the black wire on P10 the other way round - you may need to undo the cable tie on the wiring bundle, but it's otherwise totally straightforward. Do that before you check the bias.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
Really surprised how easy this stuff is and it has made a huge difference in sound, really really clean now.