Ferrograph 722 Service Manual

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series seven

L OPERATORS HANDBOOK

FEHROGRAPH

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MID-ODD. ISSUE 4

OPERATOR'S HANDBOOK

Farragmph

SERIES SEVEN. MK 2

SEFIIAL NUMBER 78.800/2 ONWAHDB

THE FERROGRAPH COMPANY LID.
IONDON AND SOUTH SHIELDS

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1- MONO -1 1-- STIRIO 1

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FIG. I react DEFINITION-HALF 1m

high pitched lgebble. depending upon the speed of the wind. To
evonda shrill. irritating sound when the tape rs travelling at high speed,
the high frequency response rs automatically reduced on "Fast". and
consequently it the tape is slowed down to hearty normal speed it
may seem a little muffled. If not required. the Output control should
be turned down or the Output switch out to "Source".

(BENEHAL DETAILS
Ghenglng Tracts

. The disposition of the conventional monophonic track upon the tape
is shown In Fig. 9. the advantage at this system being that two tracks
can be accommodated side by side on the tape. which doubles the
length at playing time perreel. In practice. after a full recording has been
made upon the top track In the normal way. the left hand spool will be
empty and all the tape on the right hand reel. They should each be
removed and replace on the opposite reel carrier, the tape being
loaded in the usual way. The unrecorded lower half at the tape has now
become the upper and may be recorded as usual. At the end of the real
the tape can be reversed again. when the first recording will again be
on_the upper half and ready for replaying. Thus on a full 7 in. real oi
Long Play tape up to 1} hours pleyr time is available at 7; in/sec.
With a break of only a few seconds h 1 way for the reel transposition.

it required. the tracks may be reversed in the middle of a reel After
stopping and opening the loading gate. both reels should be removed
and Inverted. They can then be refitted to the opposite sides and the
tape threaded through the heads in the usual way. with no twists. After
loading the rape, the loading gate must be closed before the deck
can become operational again,

On half track stereo instruments. recording should proceed as
usual (Fig. 9). out since both tracks are recorded. the tape cannot be

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reversed at the and ol the reel. However, when used monophonically on
"upper". the stereo recorders will operate exactly as described for the
mono recorder above.

The quarter track stereo arrangement is shown in Fig. 10. After
recording on tracks 1 a 3 the tape can be reversed and another recording
made on track: 2 E: 4 as shown. When recording monophonically the
usual track sequence is I - 4 - 3 - 2. This is obtained by first recording on
"upper" on side A of the reel (track 1). At the end at the reel the tape
is reversed and recorded on side 8. still on upper" (track 4). Reversing
the tape at the and. recording takes place on "lower" on side A {track 3),
leaving the final recording on lower" on side 3 (track 2).

Editing and Splicing

One of the advantages of a tape recording is that it is easily edited;
unwanted passages may be cut out and the ends rejomed. In this way a
composite programme of selected material may be built up. Of course. it
is Only possib e to edit one mono track. as cutting out or splicing in
pieces of tape obviously affects both tracks. However. once the editing
has been done tor the single track, the composite tape may be put back
on the recorder and the other track recorded in the normal way with
material which does not require editing. '

Splicing and joining the ends of out or broken tape is normally
carried out by means of suitable adheerve tape applied to the back of
the magnetic tape,whrch is usually the more polished side. For Joining
together two lengths of tape with as unobtrusive a pint as possible, a
diagonal cut at 45 to the edge of the tape is used This produces a
"silent" joint and minimises any "drop-out" effect which may occur
if the two ends of the tape do not meet quite acwrately. When edtr'ng
tapes. particularly when removing single words or noises. a vertical
joint at right angles to the tape edge is olten used. and this is also
suitable for adding leader tape and inserting stop foils. With either

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