Jam went fine indeed. It's a loud sucker!
I've replaced the stock TAD pre-amp valves with a Gold pin JJ in V1 and a standard JJ in V2 and it sounds even better, the gain is tighter and fatter, but there seems to be a bit less that's not an issue though this amp has way more gain than most people will need.
No reason why except why not :)
Gold pin JJ's may be snake oil but as I had it lying around doing nothing better.
Will need to record some clips when I can think of something to play which doesn't sound like bag of notes and hammers falling down a long staircase.