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FERROGRAPH 4A

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Technic details

Specifications

Type:
Tape Recorder Mono
Recording medium:
Standard or “Extra Play” ¼” plastic coated tape
On reels up to a maximum of 8-1/4 diameter coating inside
Track Width:
0.1” - displaced to one edge
Number of tracks:
2
Tape speeds:
15 ips, 7-1/2 ips and 3-3/4 ips, ±2%

Playing time per track (Large reel 1750 ft standard tape play):
22.5 min. at 15 ips
45 min. at 7-1/2 ips
90 min. at 3-3/4 ips
Playing time per reel:
45 min. at 15 ips
90 min. at 7-1/2 ips
3 hours at 3-3/4 ips
Rewind time:
Less than 1 min. for 1750 ft reel standard tape)
Frequency response:
50Hz to 5kHz, ±3dB (3-3/4 ips)
50Hz to 10kHz, ±2dB (7-1/2 ips)
40Hz to 15kHz, ±2dB (15 ips)
Wow and flutter:
Less than 0.2% at 7-1/2 and 15 ips
Long-term speed stability:
Better than 0.5%
Erase and bias frequency:
Approx. 53kHz
Input levels (For full Depth Recording):
Min. 3mV RMS (Input 1)
Min. 100mV RMS (Input 2)
Impedances, 1MΩ and 80kΩ respectively
Output arrangements:
15Ω 10” x 6” internal speaker
Socket on front panel for external speakers
Output power:
2.5W into 15Ω
S / N ratio:
Better than 50dB (200Hz to 12kHz)
45dB (Unweighted, including hum)
Power supply:
AC 200 - 250V, 50Hz
Power consumption:
110W

Overall dimensions (W x H x D):
445 x 470 x 248mm
Weight:
Approx. 22.57kg
Year:
Around 1956

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