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Help with a mystery vintage amp head

An electronics repair guy gave me this amp head with no markings on it. It looks homemade or from a kit. It has 4 nine pin tube sockets and four right pin tube sockets, 2transformers and some old looking armaco caps. Where kits common back in the day? What where they modeled after? I thought the knobs might be a good way to date it. Annoying that I can't post pics of it, any leads would be greatly appreciated. Thanks
macro22
atmasphere's avatar
atmasphere
11,834 posts
 
It'll probably be great for blues.
But if the restoration goes well then it might sound a lot like a Fender with better low end. This is just based on the size of the output transformer.
macro22 OP
6 posts
 
I didn't see any markings on the transformers. What are the pots on the inside for? And the 1/4" jacks? Is that an effects loop?
atmasphere's avatar
atmasphere
11,834 posts
 
No. The jacks and the pots are used to set the bias on the power tubes. It requires that the 1/4" plug be connected to a meter; without seeing the circuit closer I can't say if it would be set to DC volts are DC amps, but in the end you set the meter to the right reading using the pots. Both tubes would be set to the same value. Depending on the power tube the correct value shouldn't be hard to sort out.
BTW this amp is really off topic on this particular forum. I suspect you might find better luck- maybe someone might have even seen it before over on DIYaudio.com. They have a section devoted entirely to musical instruments.
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macro22 OP
6 posts
 
You've been a great help. I'll take it to a tech and see if I can get er going. Also try diyaudio

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