A thread in which we bring to light obscure/unknown electronics products then try to identify the manufacturer - and the reason for the device being produced.

My latest acquisitions - a pair of Tek TM500 power modules (a 501 and a 502) with one each "Universal Monitoring Module" mounted in them - fall into this class. The Modules look to be an audio amplifier/tape recorder interface which will accept an unbalanced, microphone-level input and trigger an internal relay if the applied signal rises above a panel-presettable level. High and low-cut filters are provided, each controlled from the front panel. A Headphone Out jack (w/ level adjustment) is provided on the front panel and a Line Out jack with NC/NO relay contacts is installed on the back.

These aren't someone's hacked-together DIY modules, either. They incorporate commercial quality double-sided CCAs and professionally fabricated, silk-screened front panels. Shielding is extremely well executed - better, in fact, than in a lot of Tek's OEM offerings. Yet, there is absolutely no manufacturer data or related information present on any portion of the constructs.

Shown here is the TM501/Module I won; the TM502 was set up for two Modules but only came with one. Any of you BCast Eng types know what these are and who made them?

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