Rangemaster DX250 Info

I have a Rangemaster DX250 that I need some information on , I need a schematic for the unit or maybe what was the manufacture of it or a popular transistor amplifier that looks like it , is it an automatic sideband delay unit ? my unit tx’s but the preamp does not work ,and on the right side there is a variable pot, is this where you adjust the ssb delay ? any help would be greatly appreciated.

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