1974 Ferrograph Logic 7
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It was the Japanese who introduced the concept of vertical operation, and fired the imagination of the average enthusiast, these looked more professional, and were bought because of their looks as much as anything else.

Ferrograph were slow to respond to this challenge, when they did it was too little too late.  The introduction of the Series 7 in the late 1960's was ill conceived, and poorly implemented. 

The later Super Seven tried to address some of the shortcomings, but it was too late to repair their damaged reputation. Enthusiasts who had always used Ferrographs moved their allegiance to Revox, Tandberg, Sony, Teac, and Akai.


The introduction of the "Logic 7" in 1974, solved most of the problems, but it arrived too late.  This was probably the best of the Ferrograph recorders, apart from the "Studio 8", and compares with the best available, in terms of quality and facilities, and sex appeal.  But again too late to make amends.

The Logic Seven is the machine that should have replaced the Series 6, well, in theory anyway.  At the time the original Series 7 was launched, some of the technology incorporated into this model wasn't readily available.

In any event, the Logic 7 ranks as probably the best conceived Ferrograph since the first, still some shortcomings, but we can forgive those few.

Regular 'Get Reel' contributor and avid collector Stuart Blacklock owns one of these recorders and writes:

"...My Ferrograph was used in the BBC (it had the BBC logo on it the first time I saw it). Problems with the rubbers and the fact that the  tape never came off the heads meant that this recorder had a fairly short life.

A friend had bought two of them from the BBC and tried to replace the inside wheels with Mechano ones.  It worked, but was very noisy.  He had the machines for two years until he sold them both to me for £40 each.

I dismantled both of them and managed to re-build one good recorder from the two. I also replaced the rubber wheels inside with originals. Now the machine is fully operational and should be fine for at least another two to four years..."

Additional images, user manual and circuit diagram for this recorder are featured on the CD-ROM.



Specifications at a glance
Model
Logic 7
Year
1974
Price when new (in the UK)
varied from £295 - £350 depending on options
Track system
half and quarter-track stereo versions available
Heads
three separate heads for erase, record & playback
Motors
three
Maximum reel size
10½"
Tape speeds
15 ips, 7½ ips and 3¾ ips
Frequency response ( 3dB)

15 ips: 30Hz - 20kH
7½ ips:
30Hz-17kHz
3¾ ips: 40Hz -14kHz

Wow & flutter
less than 0.08% at 15 ips, less than 0.10% at 7½ ips
Signal to noise ratio
better than 60dB (unweighted, including hum) ref. 2% distortion
Channel separation
better than 50db
Distortion
less than 0.25%
Rewind speed
approx 2 min for 1800ft, 3 min for 3600ft
Audio output power
10 watts RMS per channel into 8 ohms
Inputs
microphone: 200µV - 50mV, 200 - 1000 ohms
line: 50mV - 7V at 2 Mohm
Outputs
300mV into 10kohm line, Stereo phones & extension speakers
Dimensions
20½ x, 17½ x 10" (521 x 444.5 x 254mm)
Weight
58 lbs (26kg)
 
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