Alps rk40 Black Beauty? Please help identify!

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c3474

Member
2012-02-24 4:46 am
Oregon
I opened an old heavily modified Audire Diffet 1a preamp that I got in a package deal years back and found a couple of older Alps 50kx2 attenuators. After searching the web the only Alps model that looks like this is the rk40 aka black beauty. Can someone please help me identify these? Thank you in advance!
My preamp and headphone amp just may be getting upgraded!

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