Ice-9 wrote:I usually replace cheap output valves with decent ones as soon as I get a new amp and bias it correctly. The left over cheap valves can be handy in your gig bag in case of a valve failure at a gig.
With all the trouble you have had DrNomis I would have been taking the amp back to the shop and asking for a new replacement amp, not a repair. We spend a lot of money on our gear and they should work out of the box without problems. Cheap valves I can accept but broken wires and non working parts is a sign the amp is used, either on display in the shop or another customers return. I have had a similar problem with an Fender EVH 5150 combo, It is now 7 months since I bought it and finally am getting a replacement, the thing is i'm still waiting for the replacement coming into stock and the shop asked me to return the original weeks ago as they have to be able to re sell it. (re sell it as new ! Remind me not to buy anything from this shop again).
Sorry to droll on a bit off topic, but my point is some music shops have bad business practices and you should of had a brand new replacement, I always check when unpacking things now weather they look like they have been re packed or looks used in any way.
EDIT- WOW, ive just found the Marshall MA100C amp is now available in the UK at £399. That is a good price for a 100w valve amp. Send yours back for a refund and buy a new one for half price (nearly).
I'd get it replaced with a brand new one except the warranty on it would be well and truly void by now, but yeah you do have a very good point there.....