Marantz RHA-1
The Marantz RHA-1 is an oddity in the catalog. It's a compact unit that various period sources call a headphone amplifier, yet it also appears to have been able to drive speakers. The surviving documentation is thin and not entirely consistent. What emerges is a small, discrete solid-state amplifier that was more flexible than you'd expect.
All three German-language databases that list the RHA-1 agree on the basics. It was a solid-state design with two RCA line inputs, a phase-invert switch, a stereo/mono switch, a line-level output, and a 6.3mm headphone jack. Dimensions were 420 × 60 × 220 mm and it weighed about 2.1 kg. Output power is where the record gets murky. Multiple sources list 2 × 15W. One archival listing explicitly mentions two speaker terminals, and a separate database gives 4-ohm ratings of 2 × 22W, which would be unusual for a headphone-only design. The available material doesn't settle whether the RHA-1 drove speakers, headphones, or both.
No production years, original price, or marketing context have surfaced. No owner reviews or service documentation are known to exist either. It appears to have been a niche product, possibly intended for headphone listening with the option to feed a pair of small speakers.
What is known, in brief:
- Discrete solid-state amplifier, described as a headphone amplifier
- Two RCA line inputs; phase-invert and stereo/mono switches
- 6.3mm headphone output; line-level output
- Output power listed as 2 × 15W (one source adds 2 × 22W at 4Ω)
- Power consumption: 30VA
- Dimensions: 420 × 60 × 220 mm; weight approx. 2.1 kg
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