Intermittent red plating on standby

[subway_savage]

so now i've tried to recreate the problem by knocking around the amp and moving connectors with a chopstick, its working fine now, but there definitely seems to be a problem somewhere maybe a loose connector from the bias supply perhaps ??.

[old tube]

Bummer if you can't return it. Thought the info might allow you to get a start on where the problem may lie and hopefully you could then get it repaired.

[subway_savage]

usually when i flip the amp on its back or the other way around the problem either comes or goes.

[xtian]

(musicians warehouse Dubai)

Awesome. What's the music scene like?

[subway_savage]

ok so i think i found the problem, i have set my bias to -110v which is max i can get, hooked up my DMM to pin 5 and started poking around, i saw a suspected cap near the bias trim (C37) that looked kinda damaged, as i poked it the reading started going to -1.5v. so that cap definitely is part of the problem.

here's a picture.
[IMG1000]http://imageshack.com/a/img856/2076/jzx5.jpg[/img]

now i need to know the value of this cap

[martin manning]

Looks like the first three digits are 104 = 100,000pF = 0.1uF

[subway_savage]

no, not that cap, its the silver one with 0909 or 6060 written on it

[martin manning]

Ah, unless you can find a schematic you'll have to lift it or snip it out to get a look at the other side.

[M Fowler]

I had to fix a brand new Blackstar in a local guitar shop. I found the problem right away a connector was loose and presto the amp was back to working.

I think Quality Control is the main issue on these amps. Usually the grille cloth come all loose on the combo amps too.

Mark

[Structo]

That looks to be a polystyrene cap.

They are different looking as they aren't coated with epoxy or anything.