Well, well, well.
Opened the back up & received something of a suprise. It's actually got
5881 power valves, not EL34s, so just as well I didn't buy that Watford Valves kit :lol: I knew that SLXs were shipped with 5881s for a while but it never occurred to me that this would be one of them. It's got Sovteks in there at the moment:


& with _tom_'s
recent new preamp valves thread in mind, I also was surprised to find that the preamp valves are EIs:

Interestingly, V1 & 2 are laballed "12AX7", but v3 & 4 are labelled "ECC83"


Just for interest's sake, here is one of the EIs next to a spare TAD & JJ that I had left over after revalving my Engl:

FWIW, it's not at all microphonic with those EIs in. It's very loud. That's loud as in
LOUD. The Engl is very powerful, capable of immense volume & has incredible low end, but the Marshall has so much midrange
balls & sounds
big in a way that the Engl simply doesn't.
I was curiously underwhelmed by the sound of it through my "brutal" 4x12, it sounds far better into the Mesa 2x12", but on reflection it makes sense - the choice of speakers for the 4x12 was made with the Engl in mind because I found the top end really "hard" through V30s, so I guess it's no surprise that an amp which suits the V30s isn't as good with the CL80/K100 combination.
It's really cool to have an amp that offers a contrast to my beloved Engl. I like my Savage better - it's "my" sound, but I'm also very happy to own the SLX having covetted one for so long.
I will probably change the valves, at the very least I'll experiment with different preamp valves, but will need to find someone to do the biasing malarky for the power valves first...
PS: Thanks Steve for the link to a FS...