Opera S 611 A
Electronica · 1961
- Manufacturer
- Electronica
- Country
- Romania
- Year
- 1961
- Decade
- 1960s
- Category
- Radio
- Type
- Radio receivers
- Documentation score
- 2/5
- Last edited
- 03 OCT 2026
Specifications
- Tubes
- ECC85, ECH81, EBF89, EABC80, EL84, EM84, EZ80 (5 + 2)
- Wavebands
- LW 1035–2000 m, MW 188–566 m, SW 16.7–50 m, FM 64–73 MHz
- Sensitivity
- AM 200 µV, FM 100 µV
- Selectivity
- AM 26 dB, FM 26 dB
- IF rejection
- AM > 30 dB, FM > 26 dB
- Image rejection
- AM > 25 dB, FM > 26 dB
- Audio frequency response
- AM 80–3500 Hz, FM 80–6000 Hz
- Output power
- 2.5 W
- Loudspeakers
- 2 × 4 Ω, 2.5 VA each
- Inputs / outputs
- pick-up terminal
- Quality class
- III–II
- Power supply
- 110 / 120 / 220 V AC
- Power consumption
- 110 VA
Sources: [1]
Description
The Opera S 611 A is a mains-powered tube radio receiver designed and made by Electronica in Bucharest in the first half of the 1960s [1]. It is an AM-FM set with a VHF band, 5 + 2 tubes and 2.5 W output [1]. The Rapsodia S 612 A has the same circuit, with a built-in record player [1].
In the source table, sensitivity is given on medium waves for 0.5 W output, selectivity for a signal ±9 kHz (AM) or ±300 kHz (FM) away, the audio frequency response at 1 MHz within 6 dB, and output power at no more than 10% distortion; the quality classes are only indicative, based on IEC recommendations and the Soviet GOST 5651/1951, as Romania had no such standard at the time [1].
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