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A wooden amp chassis is not impossible to make but the wisdom is questionable. Tapped threads would wear more quickly, air circulation holes would need drilling because wood is a pretty good heat insulator … until the moment when it scorches and, possibly, catches fire.
Speaking of which, without a metal chassis to complete the ground path, every relevant component would need its own individual ground connection. Result, a veritable rat's nest of cable runs, all with the potential to be a fire hazard.
If you want the look of an all wood amp head, you could veneer the face and back plate of the chassis.
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I have a long term ambition to build another guitar amp from scratch or more likely from a kit. In the past thirty years I built two guitar combo valve amps and one stereo hi-fi valve amp. My eyesight is not what it used to be but I think that problem/issue could be overcome by using a head mounted magnifier of some sort. Part of me wants to make this amplifier 'different' from commercially available amps or kits so I pondered on the use of a timber chassis.
Anyway no decision one way or the other will be made before next Spring......
Nil Satis Nisi Optimum
If you just want the look of an all-wood head, Trainwreck did that...
... but used a conventional metal chassis.
"Take these three items, some WD-40, a vise grip, and a roll of duct tape. Any man worth his salt can fix almost any problem with this stuff alone." - Walt Kowalski
"Only two things are infinite - the universe, and human stupidity. And I'm not sure about the universe." - Albert Einstein
I once built a 5EA5 Pro Tweed clone on "phenolic" circuit board only to find out later on that the board I'd used was very slightly conductive.
I've also built plenty of hifi and guitar circuits on unscreened breadboards and in the main they were great - except for high gain preamp circuits where the lack of screening was a big show stopper - especially under fluorescent lighting.
The best SE hifi amp I had was a breadboarded Shishido/Loftin White with ECC83s and output tubes from Russian fighter jet transmitters, 6C4C's I think it was ( best use for them clearly ! )
Plus - although breadboarded amps are great fun - they're not very portable(!) and you run the risk of electrocution with valve circuits if you forget what you're doing for a second.....