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8AB2A1B is correct for the studio pre. This made it easier to work out http://www.accutronicsreverb.com/ioic.htm The color codes match, although the dc resistence was a bit off but close enough. Could be that my multimeter isn't all that accurate. Would like to get a type 9 in there but...

Doesn't help when u dont have a number on your tank. Its just the internal part suspended from the chassis with springs instead of being in an enclosure. Although i'm pretty sure its a type 8 tank i'm after based on the size. Acording to mojo music 8AB2A1B is a mesa repalcement, but i dont know...

Does anyone know the input and output impedance of the reverb tank used in the studio preamp or know of a suitable replacement.