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The First
Ferrograph?
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Is
this the very "First Ferrograph"?
Not the normally expected Wearite deck.
My own view is perhaps it was an original prototype,
before the advent of the first Wright & Weaire "Model A".
But I
could be wrong.
If anyone has any further information on this model I
would be very interested to hear from them. |
| Ferrograph Model "D" an early domestic machine. |
The deck is the early Wearite Model "A".
Picture/s by kind permission of Mrs. Hilda
Lane
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The polished wooden cabinet was a common
feature of recorders in the late
40's early 50's. But proves that Ferrograph once had an eye on appearance, as this model is obviously destined for the home
environment.
Similar in style to the G100/200 machines designed for industrial, and military use.
The
protective flap was to guard the control panel and meter from accidental damage.
These early decks had no tape counter, guides or pause control.
This design of record level meter was used in machines up to and including the Series 2.
This
early machine only accepted up to 7 inch diameter spools.
giving
1250 feet of tape, and a recording/play time per reel of one hour at 7.5 i.p.s.
For more details on this deck go to Wearite.
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GENERAL SPECIFICATIONS -
FERROGRAPH MODEL D |
| RECORDING MEDIUM |
Standard 1/4 inch plastic or paper based coated tape. On reels of 1250 feet.
Coating inside. |
| TRACK WIDTH |
0.1" - displaced to one edge. |
| NUMBER OF TRACKS |
2 |
| OPERATING TAPE SPEEDS |
7 1/2 inches/sec & 3 3/4 inches/sec |
| PLAYING TIME PER TRACK |
33 min @ 7 1/2 inches/sec
66 mins @ 3 3/4 inches/sec |
| PLAYING TIME PER REEL - 7 inch diameter |
1 Hr 6 mins. and 2 Hrs 12 mins. respectively. |
| REWIND & WIND ON TIME |
Less than 1 minute for a full reel of tape. |
| FREQUENCY RESPONSE CAT A TAPE |
+/- 3 dB 60 - 9000kHz @ 7 1/2 inches/sec. |
| WOW & FLUTTER |
0.2% @ 7 1/2 inches/sec. |
| ERASE & BIAS FREQUENCY |
Approx. 53 kHz |
| INPUT LEVELS FOR FULL DEPTH RECORDING |
Socket 1 min signal .002V peak
Socket 2 min signal .07V peak |
| INPUT IMPEDANCE |
1 Megohm & .5 Megohm respectively |
| OUTPUT ARRANGEMENTS |
2.5 ohms 8 inch internal speaker.
Socket at rear for 15 ohm speaker or loads.
Connection at rear for 2.5 ohm external speaker.
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| OUTPUT POWER |
3 Watts into 15 ohms. |
| SIGNAL TO NOISE CATEGORY "A" TAPE |
50 dB |
| WORKING VOLTAGE |
200 - 250 Volts A.C. |
| POWER CONSUMPTION |
90 Watts |
| DIMENSIONS |
17 1/2 inches x 14 inches x 12 inches high |
| WEIGHT |
50 lbs. |
| FULL MODULATION ATTAINED AT A PEAK METER READING OF "6" |
| The user manual clearly defines the maximum level on the meter to achieve full modulation. This ensures
maximum recording level without distortion and helps to attain the claimed signal to noise ratio. |
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