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Mohawk 300 →
The device measures 220 x 100 x 55 mm and weights 1.3 kg with batteries
and tape cartridge. It is powered by two batteries: a
large one that provides 1.5V for the filaments and
9V for the motor, and a small one that provides
the 30V anode voltage for the miniature valves (tubes).
All controls and connections are at the front. There are sockets for a
microphone and an earpiece. An external amplifier was available separately.
Audio is recorded on a 6.35 mm (¼") wide reversible tape that runs
at 4.76 cm/s. The cartridge can hold 30 minutes at either side. 1
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The device can only record and playback. For rewinding, the crank – integrated
in the hinged lid – must be used.
Development of the Midgetape 44 started in 1954, with a projected sales price of
US$ 197.50, but when the device was released in 1955, the sales price had meanwhile been increased to US$ 249.50 [2]. It was succeeded in 1957 by the
fully transistorised Midgetape 300.
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Later versions of the tape cartridge could hold 2 x 45 min.
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Device Miniature audio recorder Purpose Dictation, covert recording Model Midgetape 44 (BR-1) Manufacturer Mohawk Business Machines Year 1955 Medium Tape Width 6.35 mm (1/4 in) Speed 4.76 cm/s (1 7/8 in/s) Cartridge 30 min/side Output 3 mW into 2000Ω Response 200 - 4000 Hz W&F < 0.7% Valves 3 (see below) Power LT: 1.5V/9V (45 hours) - HT: 30V (100 hours)
Dimensions 220 x 100 x 55 mm Weight 900 grams (1.3 kg with batteries and tape cartridge) Price US$ 249.50 (1955) 1
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- 2 x CKS49DX or XFW50
- 1 x CKS42DX or XFY54
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- Tape cartridge (2 x 30 min)
- Battery set
- Clip-on lapel microphone
- Earphone
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- External amplifier (US$ 35)
- Tape cartridge 2 x 45 min.
- Audio cable (for connection to external amplifier)
- Leather carrying case
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Initially announced in 1954 for US$229.50 [2].
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At the front panel is a 2-pin socket for connection of a miniature earpiece,
such as the ones that were used with hearing aids at the time. This socket is
not suitable for connection of a loudspeaker. If a higher audio volume is
required, an external amplifier could be added, which was available for
~ US$ 35 (1955) [2].
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Also at the front panel is a circular socket for connection of a
high-impedance microphone, such as a crystal microphone. This connector is
different from the 6-pin one used on later Midgetape recorders.
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© Crypto Museum. Created: Thursday 09 June 2022. Last changed: Monday, 12 February 2024 - 15:06 CET.
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