Marantz ST 300
A model number that turns up in the archive's source material attached to three different things — and none of them is a Marantz tuner.
Overview
The honest answer about the Marantz ST 300 is that the documentation doesn't support an entry. The fact sheet for this page came back empty — no specs, no production years, no price, no design notes, no owner reports — and the source material that did arrive under the "ST 300" label doesn't describe a Marantz product at all.
Look at what the excerpts actually contain. The "ST-300" in the 1982 and 1974 Audio material is the Dayton Wright ST-300, a matching stereo transformer unit for the XG-8 electrostatic speaker system. The Audio (July 1971, p.18) new-products column describes the XG-8 as a full-range electrostatic using eight drivers without crossovers, operating from 32 Hz to 19 kHz, and notes that the buyer could choose either the ST-300 transformer — which the column says would handle 350 watts per channel — or the 27014A amplifier/equalizer. The ST-300 transformer itself was priced at $525 in that listing. Later classifieds in Audio (December 1974) show Dayton Wright XG-8 Mk II panels being sold with "ST-300 matching transformer," and a 1982 service notice in the same magazine offers factory retrofit work on Dayton Wright speakers and ST-300 units. None of that is Marantz.
The other "ST-300" hits are equally unrelated. A 1982 Audio show report lists a Threshold Stasis ST-300 stereo amplifier at $1,800 — 150 watts per channel, part of the Stasis line alongside the ST-150 and ST-500. A 1983 classified offers Frank Van Alstine rebuilds for Dyna ST-300 transformers. A 1980 High Fidelity tuner roundup mentions a TPT-3001 programmable tuner from a different maker entirely. Every one of these is a coincidental model-number collision, and attributing any of their specs to a "Marantz ST 300" would be fabrication.
The fact sheet's own research note flags the same trap: the Marantz ST 300, if it exists as a distinct product, is a tuner, and sources may conflate it with similarly named Marantz integrated amplifiers or with earlier and later tuner models. That warning is the only solid piece of information the archive has. No manufacturer document naming this exact model was found in the source set, so nothing here rises to the level of a citable spec.
What the archive can say with confidence is narrow. The Marantz brand catalog contains a long list of tuners — the Model 20 and 20B, the 104, 120-FM, 125, 140, 150, 210, 2130, 4220, 4230, and the ST-8 among them — but the ST 300 does not appear as a confirmed member of that family in any source reviewed for this page. Whether the model number belongs to a real Marantz tuner that simply hasn't been documented, or whether it's a mislabeled or phantom entry, cannot be resolved from the material at hand.
Collectors who own a unit badged "Marantz ST 300" and can supply photographs of the rear panel, a serial number, or a page from an owner's manual would move this entry forward considerably. Until then, the archive would rather publish a short, accurate page than a long one built on borrowed specs from Dayton Wright transformers and Threshold amplifiers that happen to share three characters of a model number.
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