Mamaia S 651 T
Electronica · 1965
- Manufacturer
- Electronica
- Country
- Romania
- Year
- 1965
- Decade
- 1960s
- Category
- Radio
- Type
- Radio receivers
- Documentation score
- 2/5
- Last edited
- 03 OCT 2026
Specifications
- Transistors
- 2SA435, 2SA235, 2 × 2SA234, 2 × EFT352, 2 × EFT353, EFT317; diodes EFD112 (2), EFC107, 2 × EFD115
- Wavebands
- LW 150–273 kHz, MW 530–1605 kHz, SW 5.9–18 MHz, FM 64–73 MHz
- Sensitivity
- 300 µV
- Selectivity
- AM 22 dB, FM 18 dB
- IF rejection
- 20 dB (MW), 40 dB (FM)
- Image rejection
- 26 dB (MW, FM)
- Audio frequency response
- AM 120–2400 Hz, FM 120–6000 Hz
- Output power
- 0.5 W
- Loudspeakers
- 8 Ω, 1.5 VA
- Tone control
- two-step switch
- Construction
- printed circuit boards
- Design / kits
- Japanese licence
- Power supply
- 6 V (4 × R20 1.5 V cells)
- Dimensions
- 274 × 171 × 75 mm
- Weight
- 2 kg
Sources: [2]
Description
The Mamaia S 651 T was the first Romanian portable radio with an FM (VHF) band, made by Electronica in Bucharest under a Japanese licence [1][2]. In 1964 Japanese kits for an AM-FM portable were brought in to learn VHF reception with transistors, the combined AM-FM IF path and the stability of linear amplifiers; in 1965 the “Mamaia” series, approved that year, went into production at about 60,000 sets a year [1][2]. Through it the works learned Japanese manufacturing technology, but it still had no Romanian transistors for the 60–100 MHz range of the VHF block [1].
It was made in four almost identical versions, with a fine-tuning control for short waves [2]. With the experience gained, Electronica designed all its own AM and FM RF coils for transistor radios of every class [1]. The Mamaia became the basis of a family of five construction types, developed in two directions: export versions with CCIR wavebands, and domestic versions with OIRT wavebands and progressively more Romanian components [1]. Its table version was the Nordic [1].
In the source table, sensitivity is given on medium waves for 50 mW output, selectivity for a signal ±9 kHz away, and output power at 10% distortion [2].
Gallery
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Schematics
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Documents
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References
- [1]D. F. Lăzăroiu, N. Millea et al. – „Electronica românească. O istorie trăită”, vol. I, AGIR, section II.4 „Uzinele Electronica, 1966–1981”, pp. 159–160
- [2]D. F. Lăzăroiu, N. Millea et al. – „Electronica românească. O istorie trăită”, vol. I, AGIR, section II.3 „Uzinele Electronica, 1960–1965”, p. 132 and annex II.3.2, pp. 149–151