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FBI ← M-75B
Miniature tape recorder
- this page is a stub
Alpha One is a miniature covert audio tape recorder,
manufactured in 1971 by Amerex Electronics, Inc. in New York (USA)
and sold by Identcorporation in Japan.
The device is the successor to the EDI M-75B
made by Electro Data, Inc. (EDI)
in Fort Lee (New Jersey, USA).
It was aimed at the intelligence and law enforcement community,
and was popular amoung private investigators.
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- Tape cassette (rather than separate spools)
- Redesigned electronic circuit
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At the right side of the device is an 11-pin socket for connection
of the microphone, speakers, start/stop switch etc. This SRM11S socket
is made by JAE (Japan) and accepts an SRM11P plug. Compatible plugs
were made by Winchester and CDM Electronics.
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- Head 1
- GND
- Head 2
- Out 1
- GND
- Out 2
- In 2
- not connected
- In 1
- Battery 2 (+1.4V)
- Power input (+1.4V)
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Below is the wiring of the accessory connector when recording the audio from
the two connected microphones: MIC1 and MIC2. Note the three wire loops in the
connector: AD, BE and CF. A switch should be connected between contacts L
and M. It connects the battery (B2) to the circuit.
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Below is the wiring of the accessory connector when playing back audio via the
two speakers or headphones: SPK1 and SPK2. Note the three wiring loops in the
connector: AK, BE and CH. A switch or a loop wire should be connected between
contacts L and M to enable the power.
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Device Miniature audio cassette recorder Purpose Covert recording of conversations Model Alpha One Manufacturer Amerex Electronics, Inc. (USA) Reseller Identcorporation (Japan) Channels 2 (stereo) Power 1 × RM-625 1 and 1 × RM-822 2 button cells
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The RM-625 was replaced by the PX-625.
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The RM-822 was replaced by the PX-822.
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© Crypto Museum. Created: Saturday 17 May 2025. Last changed: Saturday, 17 May 2025 - 21:26 CET.
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