Trip to Aitken Audio to work on the T120 prototype

Been working on using the pile of Sound City 120 PAs as a base for new amp builds, since they don’t retain much value, being PAs. Basically, taken a Sunn Model T preamp and built on to updated output section of the 120 (different PI, individual bias), assembled in a bus bar style (sort of like all the stuff people claim of point to point, but true because you can have a good layout with it). Travelled up to Sheffield to visit Aitken Audio with the prototype to get it tweaked and talk plans.

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Prototype on the bench having tweaks after first round of testing, addressed some mechanical potential issues, tone control sweep and gain levels.

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Blasting it through a vintage Acoustic cab, check it does what its supposed to. Seems a fair bit of instrument character comes through in spite of being driven pretty hard.

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Next one started in powder coated chassis.

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Also collected this Invader 60 from being sorted. Weird layout, interesting amp, with a pretty good sound, gets pretty snarly dirty when pushed. Plus the tone stack is pretty nice, 2 band, actually does stuff. 2 EL34. £250.

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Invader 60 valve amp, novel layout.

This one has been in a damp shed for a while, so will need some drying out and cleaning, because it smells weird.

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Knobs on top of the chassis:

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Board mount stuff, boo:

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Tiny output transformer isn’t my bag, also no impedance selector, hope this isn’t another 100v line job, doubt as has ‘high gain’ inputs.

And the underneath:

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Pretty neat wiring, sort of looks like hadn’t really got the idea of the whole PCB thing, with putting loads of wires over it.