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Help identifying Schaller Reverb tank
Old 1 week ago
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plutoniq's Avatar

Help identifying Schaller Reverb tank


I’ve been restoring an old Schaller Reverb unit that has been a bit neglected (on loan to my buddy for 20yrs), the main issue is that the reverb sounds unpleasant, raspy/scratchy/overdriven.

I’ve gone through and recapped all the electrolytics, that got rid of some hum, i then had a sense that the AD191 AD192 drivers may be bad so i bought so NOS and replaced, no improvement.

There are 4 siemens BC109B’s that look corroded and i’ve got a new set enroute, but i’m thinking they actual problem probably lies with the tank itself.

Unfortunatley, there are no part identifiers on the tank. It looks like a type-8 tank, but instead of 3 springs it has 4 (2 on the top and 2 underneath).

I don’t see anything modern built around that design so i’m considering just going with a 3-spring version (unless ive missed a 2x2 one available). Problem is i have no idea what the impedence values are, but i think i read that you can identify by looking at the coil colors?

Any help with identifying what model tank this is and what its in/out impedence might be. The transducers look like theyve seen better days, so can’t help but feel i need to replace the whole shebang.

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Help identifying Schaller Reverb tank-7c585904-1262-4617-a600-05766846fdc2.jpg   Help identifying Schaller Reverb tank-bb105142-73bb-458b-8687-f707db7ac7bb.jpg   Help identifying Schaller Reverb tank-3ebe1095-7870-4f05-b99a-8573faa83012.jpg   Help identifying Schaller Reverb tank-598b3906-ae74-4743-828c-788217f56dd7.jpg   Help identifying Schaller Reverb tank-a8c5b8db-9fdd-4c13-9483-2ed49cfb0092.jpg  

Help identifying Schaller Reverb tank-a2b40b76-e713-471e-8195-5856e463b05f.jpg  
Old 1 week ago
Gear Head

Other than obvious mechanical damage (usually in an abused combo amp), it has been my experience that when a reverb tank fails, usually one of the coils has gone open circuit. You can test for that quite easily, without knowing the coil specs. From what you described, I would check the output coil first (disconnected from the preamp).
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