Marantz PM-80BL (1989)
The Marantz PM-80BL is a Japanese-market integrated amplifier from 1989, priced at ¥60,000 at launch. The "BL" suffix marks a cosmetic variant - essentially the PM-80 in black - though the PM-80BL listed for slightly less than the PM-80 (¥60,000 versus ¥65,000). It is remembered as one of the early-1990s "high cost performance" models. Marantz shared parts across multiple designs to get genuine quality at an entry-level price, and that also helped underwrite small-production flagships like the PM-95 and PM-99SE.
Electrically, it's a Class A / Class AB switching design. In Class AB it's rated at 100W + 100W into 8Ω (120W into 6Ω, 140W into 4Ω), with dynamic power reaching 340W into 2Ω. In Class A it delivers a more modest 20W + 20W into 8Ω. THD is rated at 0.0008% at 1kHz into 8Ω, with a damping factor of 180. The front end of the power stage uses a Sanyo STK3102IV module. It's a bipolar design (the later M80a went MOS-FET). The power supply is unusually serious for the category: an 18,000µF × 2 custom electrolytic capacitor bank behind a large transformer, with a noise-killer circuit to suppress the 100kHz - 1MHz rectification hash that can smear the sound. Marantz also used silk-fiber and Manila-hemp paper separators in the signal-path electrolytics, and a paper-polyester PCB said to damp vibrations. A source-direct switch bypasses the tone controls, tape monitors, and processor loop entirely.
Phono support is MM only - 2.5mV/47kΩ sensitivity, 85dB S/N (A-weighted). MC is not supported. There are five line inputs, three tape loops, and a processor connector for an external graphic equalizer. A Class A/AB front-panel switch lets you run Class A for normal listening and flip to AB for high-power passages. The bias switching is done via photo-coupler to keep the switching path short and the sonic penalty small.
Japanese critics received it warmly. Stereo Sound (季刊ステレオサウンド No.93) ranked it 7th in its Best Buy poll, and Tetsuo Nagaoka gave it the grand prize in his "Dynamic Test." Nobuyuki Fu noted that buying the parts yourself would cost more than the retail price, which shows how hard the volume production was leveraged. The caveat, as Stereo Sound made clear, was that this was praise within the budget category: "a good product for a low-priced model." One reviewer put it bluntly: the ¥65,000 ceiling is plainly audible.
The used market is complicated. The PM-80BL sells cheaply - recent Yahoo! Japan auctions closed anywhere from ¥3,081 (poor condition) to ¥26,419 (high bid, 63 bids). But these are old units now, and the Sanyo STK3102IV power module has no replacement parts available. Collectors tracking these units generally agree that repair costs will exceed the purchase price, and that a modern Marantz integrated (PM6007, PM7000N) or a different vintage choice is the more realistic path for most buyers.
Known Specifications
- Class AB output: 100W + 100W (8Ω), 120W + 120W (6Ω), 140W + 140W (4Ω), 20Hz–20kHz, both channels driven
- Class A output: 20W + 20W (8Ω)
- Dynamic power (Class AB): 340W (2Ω), 220W (4Ω), 170W (6Ω)
- THD: 0.0008% (1kHz, 8Ω)
- Damping factor: 180 (8Ω, 20Hz–10kHz)
- Dimensions: 454 × 165 × 380 mm; 17.5kg
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