Western Electric Project 661
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Project 661 appears to have been a special package designed for Western. It contains a brace of GPT-750's, configured for both AM (plate-modulated) and SSB (using an external SBE). The package also contains a pair of GPR-90RX's with MSR SSB converters, and an RTC to control the transmitters. There are also several patch panels, what may be special antenna couplers, and 2 speaker panels. The date for this assembly isn't clear, but the GPT-750's are -1's. The first GPT-750 drawings appeared in 1955, and it appears that the cabinet re-design happened in 1956, so the evidence suggests that Project 661 was built in 1955 or early '56.
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