Ferrograph Logic 7d specifications

General

Connections

Tech nical data

Special equipment

English handicraft from the 70s. This machine is designed as a Dolby (R) version. All load-bearing components are made of solid aluminum, but nevertheless this Logic 7, like all ferrographs, is very heavy with 26Kg.

The Logic 7 offers four speeds, whereby three are always directly selectable (7.5, 19 and 38). Fer rograph Logic 7 is designed as a 3-head machine, whereby the recording can basically be adjusted to the "original" by the adjustment knobs mounted on the front panel. This machine is a half-track machine, whereby there should also be a four-track version. All inputs as well as all outputs are designed as a 6.3 mm jack, which are connected to ground via internal contacts and thus the term "open inputs or outputs" is not to be found in Fer rograph, but unfortunately is unavoidable in the case of fashionable RCA connections.

Due to age, the rubber parts decompose on these machines. Especially the capstan roller and 3 pressure rollers. Since there is currently the possibility to re-vulcanize them on the original cores, this has also been done with this machine. For example, DAVE DURRANT (david.durrant@btinternet.com ) from England a convincing service with very good results. To re-vulcanize all four wheels at Dave, this service costs about 70 EUROS incl. Shipping.

The iron pen [1]

Manufacturer: Fer rograph
Model: Logic 7 (Dolby)
Years of construction: 1976 -
Made in: England
Color bottom part: dark brown (lighter than RAL 7013)
Color Middle part: light beige (lighter than RAL 9002)
Color top: dark beige (darker than RAL 1019)
Remote control: cable logic, optional
Power consumption: 100 watts
Dimensions: 51.5cm wide x 44.5cm high x 25.5 cm deep
Weight: 26 kg
Original price approx.: 3.600 DM

Number of outputs: 4 Stereo
- Line, 600 ohm, Speaker, Headphones (8-600 Ohm )

Line, Mic

Line, 600 Ohm , Speaker, Headphones ( 8-600 Ohm )

Line, Mic

max. Coil diameter: 26.5cm
Drive: 3 motors, (2 winders, 1 capstan)
Heads: 3
Tracks: 2
Tape speeds: 9.5, 19, 38
Pitch variations: 0.08% at 38cm/s, 0.1% at 19cm/s, 0.17% at 9.5cm/s
Synchronisation fluctuations: less than 1%
Total frequency response: 30-20kHz at 38cm/s, 30-17kHz at 19cm/s, 40-14kHz at 9.5cm/s
Signal noise distance: better 60dB
External voltage distance: -
Total harmonic distortion: less than 0.25%
Crosstalk attenuation: Stereo 50dB; Mono 65db at 1000Hz
Cancellation attenuation: -
Pre-magnetization and cancellation frequency: -