Ferrograph Logic 7d
Data[edit]
General
- Manufacturer: Ferrograph
- Model: Logic 7 (Dolby)
- Years of manufacture: 1976 -
- Made in: England
- Color lower part: dark brown (lighter than RAL 7013)
- Colour middle part: light beige (lighter than RAL 9002)
- Colour top: dark beige (darker than RAL 1019)
- Remote control: Cable-Logic, optional
- Power consumption: 100 Watt
- Dimensions: 51,5cm wide x 44,5cm high x 25,5 cm deep
- Weight: 26 kg
- Original price approx.: 3.600 DM
Connections
- Number of outputs: 4 stereo
- Line, 600 Ohm, Speaker, Headphone (8-600 Ohm)
- Number of inputs: 2 stereo
- Line, Mic
Technical Data
- max. coil diameter: 26,5 cm
- 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
- Synchronization fluctuations: less than 1%
- Overall frequency response: 30-20KHz at 38cm/s, 30-17KHz at 19cm/s, 40-14KHz at 9.5cm/s
- Signal to noise ratio: better than 60dB
- Signal-to-noise ratio: -
- Distortion factor: less than 0.25%
- Equalization: -
- Crosstalk attenuation: Stereo 50dB; Mono 65db at 1000Hz
- Cancellation attenuation: -
- Premagnetization and extinction frequency: -
Special Features
- Dolby, MPX
- Horizontal/vertical mode switch
- Tape tension switch for use with reels up to 26.5cm.
- 10 Watt control amplifier with pre-backband control.
- Transfer switch for re-copying
- Bias adjustment and display before and during recording
- Duoplay, multiplay and echo without additional equipment.
- Mixing of mic and audio signals.
Remarks[edit]
English handmade machine from the 70s. This machine is a Dolby (R) version. All supporting components are made of solid aluminium, but nevertheless this Logic 7, like all Ferrographs, is very heavy at 26Kg.
The Logic 7 offers four speeds, three of which are directly selectable (7.5, 19 and 38). Ferrograph Logic 7 is designed as a 3-head machine, where the recording can basically be levelled to the "original" by the front panel mounted adjustment knobs. This machine is a half-track machine, although a four-track version is also said to be available. All inputs, as well as all outputs are designed as 6.3 mm jacks, which are connected to ground via internal contacts without being switched. Thus, the term "open inputs or outputs" is not encountered at Ferrograph, but is unfortunately unavoidable with fashionable RCA connections.
Rubber parts[edit]
Due to age, the rubber parts of these machines decompose. Especially the capstan roller and 3 pressure rollers. Since there is up-to-date again the possibility to vulcanize these on the original cores again, this is also with this machine as well. For example DAVE DURRANT (david.durrant@btinternet.com) from England offers a convincing service with very good results. To re-vulcanize all four wheels at Dave, this service costs about 70 EURO incl. shipping.
Pictures[edit]
Reports[edit]
The Iron Scribe [[1]]