Marantz Model 1200B
The 1200B is interesting from a documentation standpoint. The factory service literature exists, and it says more about the model's lineage than about the amplifier itself. The addendum to the 1200B manual states that the document "is the same as the original manual except for the following" - and the following is a numbered list of corrections. Read together, they amount to a find-and-replace instruction. Throughout the original manual, swap "Model 1200" for "Model 1200B," and swap "A"/"B" channel designations for "L"/"R." The addendum also applies to units "bearing serial numbers above 5900." So the 1200B is a revision of the Model 1200, not a clean-sheet design. The service documentation was carried over wholesale and amended in place.
The corrections show what the revision actually changed. High-level input impedance went from 100 kΩ down to 25 kΩ (at 1 kHz). The phono spec was clarified to 1.35 mV at 1 kHz into 47 kΩ. The bias-adjustment test point moved from 10 watts to 7 watts. The relay-operation check was tightened from two minutes to thirty seconds, and the hum-and-noise test figure dropped from 36 mV to 25 mV. A new "No Output" symptom was added to the troubleshooting section, with a short list of resistors and transistors to check - R529, Q510, Q511, and Q802 through Q805. A clipping test into a 4-ohm load at 25.5 V AC was also specified. The parts list notes which components differ from units prior to serial number 3501. None of this is glamorous, but it shows how the product was serviced in the field.
Beyond the manual, the record is thin and single-sourced. A Swedish spec page lists it as a power amplifier and gives 100W per channel continuous into 8 ohms, 20 Hz-20 kHz, 0.1% THD, 0.5% SMPTE IM, damping factor 100, and tone controls of ±10 dB at 50 Hz and 15 kHz. The range of a 700 Hz mid control is unreadable in the source. The "power amplifier" label conflicts with most other listings, which call it an integrated or "console stereo amplifier," and the integrated designation is better supported. One listing describes it as a top Marantz model with a warm, powerful, detailed sound, and a Croatian source says it was produced in the USA. An Italian source gives an original price of 670,000 lire. A Pinterest caption dates it to 1974 and a YouTube listing to 1972. Neither is corroborated, and a seller's "golden period 72-75" is characterization, not a production date. No dimensions, weight, S/N ratio, or independent professional review have surfaced.
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