[TMC] Early Version of TMC GSB-1

[triodes at optonline.net]

I recently acquired a virtually as-new GSB-1 SSB Converter. This is the second unit I have had, and inside and out it is in pristine condition. It came with an equally nice early version of the GPR-90. The GPR-90 has the original TMC accessory crystal calibrator installed.

This GSB-1 is significantly different from the first GSB-1 that I had. The circuitry appears more complex with an additional sideband filter module. There are (2) FP-style filter capacitors instead of the one in the later version, and the rear of the cabinet is not open; it has perforated stock covering the rear opening. The overall chassis layout is different as well.

Perhaps someone can shed more light as to the differences between the earlier and later versions of this fine SSB converter unit.

Does anyone have the schematic/manual for this earlier version unit? This particular GSB-1 does not currently require any service, but I would like this documentation for my file.

Thanks for your help!

73,

Bruce, W2XR