I think you have a ground point that has failed. When it gets hot the connection gets good and works awhile. Very hard to narrow those down. You need a tech.
9 watts will be twice as loud as 5 watts.
Tube crunch at a low volume: everybody wants it, few or none ever really get there. Either it's still too loud or with an attenuator or master vol it now sounds weak and dull.
There's no way of knowing which amp sounds best without hearing them...
Pedals with tubes and big claims come and go. I've seen dozens over several decades.. Amps based on Fender amps from the 50s have been around as long as electric guitar and are still here.
Hmm, I wonder which will have staying power?
Yeah everybody here says a twin isn't too loud, master volume, overdrive pedal, blah blah blah.
Yet I NEVER see any one using a sf twin except once in awhile a major label country guy....no not even them. Or plexi front Marshalls either for that matter.
Dude, do you need an amp that's as heavy as a boat anchor and so loud you can't play it ANYWHERE? Why do you think deluxes are $4k and Twins are $800.
Great amp. But not practical for anything unless you just joined an Allman Brothers tribute band that plays outside in cornfields with no PA support.
Here's the REAL ANSWER.
Table Saw.
It would be best to cut the head box in half and add what you need to the middle.
Or just leave the middle open. The chassis bolted to the 2 pieces would hold it all together.
Post pics when you are done.
I don't have any but if I did I would put them in a vault and save them for when we get the 20 minute warning of the end of the world. Then I would throw them in any fender I got laying around and blast full volume until the world was vaporized in a cloud of 6L6WGB sonic ecstasy.
These have been the only amps I've gigged with for the last almost 5 years. Don't let anybody tell you these are toys.
Hint. If you use it alot in a gig setting you are going to need to replace those el84s about 3 times a year. It's the vibration from the speaker that rattles them to death. Buy...
I'm not sure why you couldn't do what every 6 year old kid can do which is google the price on your iPhone. That amps price is way high though. I wouldn't pay that for a boogie either.
You will never use those tubes in a guitar amp unless you build something specifically designed for those tubes. You don't even know if they are still good. Toss them.
If you are a beginner you dont need a tube amp. Just get some kind of used peavey bandit from a pawn shop for $100 and play for a year or 2. Don't get caught up in the hype.
I'm a hard core tube guy and have had many 100w and 50w Marshalls and I use tube amps every day ....but....I also...
Back in the 60s, dept stores like Woolworths had all tube PA systems for sale announcements and clean up on isle 10 type stuff. They left those on for days, years, and decades. They probably never turned them off except by accident.
However guitar amps ain't ducane PA systems. PAsytems were...
When the tubepocolypse comes, roving gangs of tube eating zombies will go door to door raiding for your tubes. You better build an all steel underground shelter for your last remaining supply of tubes because that day is close at hand.
I got a better idea. Let's take the city skylines of the world and cover the skyscrapers in glass tubes so they all look like tube amps. Maybe cover the lower buildings in tweed to look like cabs and combos. Yeah this idea will catch on quick.
Mmmm, a $6k power regulator to regulate power to a $800 amp. Or in my case a pair of $160 monoprice amps that I use for bar gigs. Or I could buy a cool boat.