"Mike Gilmour" wrote in message
...
Hi Keith,

Reckon you already nailed the problem caused I guess by that failed
coupling
cap. Did the cooked resistors burn the pcb at all?


Just a tad! - See

http://www.apah69.dsl.pipex.com/keith_g/show/burn1.JPG

and

http://www.apah69.dsl.pipex.com/keith_g/show/burn2.JPG

- sometimes standing them
off a bit avoids that damage should it happen again.


Yes, I think I should have stood them off a bit more than I did (others are
stood off by a good cm or so), but it don't help that the 'component side'
of the board is actually the underside in use! (If the tracks do get burned
off in the future, it won't be the first board I've had to augment with a
bit of 'hard wiring' !! :-)


I've also had the
very occasional '88 flashover on Svets that seems to be just down to a
rogue
tube, swapping it out has cured it.


I think I've had 3 or 4 go in the last 2 years with this amp.....


KT88 vs 6550, my experience is the '88 are much more musical but
ultimately
don't have the same clout. The bass from the 6550 seems more powerful but
not necessarily as sweet..


That's exactly what I'm getting! - No less pleasing overall but a bit
'different' to what I've been used to.


but this varies a hell of a lot from amp to amp so
I guess its just horses for courses in the end - whatever suits your
particular system. I sometimes change from KT90's to 6550's to KT88's just
to enjoy the strengths of each - none is perfect but an orchestral
symphony
sounds just great with '88's and Black Sabbath with 90's with the 6550's
serving most other listening.
I've hit your site a couple of times - hows the hit counter doing??


Heh heh! I just checked and was visitor No. 10,000!!! Thanks for your help,
Mike!

:-)