"Gareth Magennis"

Looks like someone may have tried to sort this problem out before, but
didn't replace the PCB?

http://www.lynx.bc.ca/~jc/TSL122.html


** The PCB material is definitely the cause of the problem.

It is made from UTTER CRAP !!

However - uber clever fixes involving a Dremel or mounting resistors in
mid air or any similar hare brained ideas are all just re-arranging the deck
chairs on the SS Titanic.

If no new PCB is available from Marshall at a reasonable price - just add
a bloody fan !!!!!!!!!!!!!!!!!

A single 120mm, 240VAC fan blowing directly on the OP tubes from below cures
the overheating / bias runaway problem completely.

BTW:

Marshall are a total bunch of arseholes.

The Pox of the audio industry.

Just like their ****ty amps.



.... Phil