I'm getting some cracks coming through the speaker once it's been switched on for a few minutes, which I gather is often a symptom of a shorting output valve. The volume of the noise is unaffected by gain or master settings - so I assume it must be a problem in the power stage? It is loudest on the 5 watt setting, quieter on the 15 watt setting and at its quietist on 30 watts.
So far, the rectifier valve and fuse (which is the correct rating) have survived.
I'm guessing it's time to replace the output valves?
I realise a massive amount of rebranding goes on, so what EL84s should I be buying - and who from?
Do I need four which are matched, or will two matched pairs suffice?
Amps are really not my thing - time for the wisdom of
@ICBM!
Comments
I'm sure four matching Mesa-branded EL84s will sort the problem out but money's tight at the moment. Saving a few quid is an appealing prospect but if it only results in further expense down the line, it's a false economy.
"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
Thanks for the advice gentlemen.