Brenell Mk5 p

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MARK 5 TAPE RECORDER

SPECIALLY DESIGNED to meet the more exacting
requirements of those who wish to employ tape
recording for the teaching of music, the drama,
foreign languages or other educational purposes
-in addition, of course, to normal recreational
use and industrial purposes-the new Brenell
Mark 5 has a choice of 4 speeds and many other
additional features of considerable value.

Indeed, as one studies the Specification shown
overleaf. it becomes obvious that no effort has
been spared to ensure that the quality of its
reproduction attains a very high level.

Nor is this all-for, by means of a 3-position
switch, frequency correction is automatically
applied at 15, 7; and 3;} i.p.s. to C.C.l.R. standards
This ensures that the correct play-back character-
istic-so essential for optimum fidelity-is always
available. The ultra-efficient Brenell Sound-heads
-the carefully designed 50 K/cs oscillator circuit-

the application of negative feed-back to secure a
uniform level throughout the wide frequency band
-the use of a large internal elliptical speaker of
high fiux density-all these play their part in
permitting the attainment of a standard of perfor-
mance which will never fail to delight the most
critical ear.

Finally, because it is realised that such a versatile
instrument will be subjected to long and arduous
service, Brenell engineers have developed a Unit
Assembly System which, by permitting the instant
disconnection of any of its several units, makes
internal inspection, lubrication, adjustment or valve
renewal literally a matter of minutes.

The Mark 5 complete
(including 1,200 fl. of tape)

64 gns.

Cm: be filled with one pair of additional Son/u] Hem/s (with
pressure pad assemblies) available at extra (03! of 88/-.
Cr yxtal microphone 5 gns. extra.

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Special Features of the
BRENELL MARK 5
TAPE RECORDER

Three Independent Motors chosen for their high degree
of speed stability with exceptional reliability and endurance

Four Recording Speeds, 1;. 3.2 7; and IS for maximum
versatility under all circumstances.

Instant stop without spillage achieved even at high speeds
by positi\'e mechanical system of proved reliability.

Pause Key to halt tape mmement temporarily when recording
or playing back. Permits the easy omission of unwanted
announcements or musical passages and therefore saves tape.
Digital Rev. Counter enables any portion of a recording
to he quickly located when desired.

Hi-Fi Amplifier is of advanced design and, at the turn of a
switch. can he used quite independently of the Tape Recorder.
Thus it becomes available for any public address announce-
ment application or. for example, in conjunction with an
F.M, Tuner and gramophone turn-table as a complete
Radiogram.

Recording Level Indicator. During recording the peak level
is at all times clearly visible on the latest type of miniature
magic eye. In this way recordings of unvarying quality can
be made without the slightest risk of failure.

Monitoring Facilities. During any recording operation
high impedance headphones (LOCO/4,000 ohms) can be
plugged into the socket provided-rat great convenience when
recording from a distance or when using a mixer unit.
Permits the use of 8%" dia. Reels. For professional or
other applications where recordings are required to be made
at a speed of IS i.p.s.t the facility of being able to use 8 : dia
reels will be greatly appreciated.

AIimuth Head Adjustment. This ensures highest quality
of reproduction from commercially pre-recorded tapes and
also permits interchangeability with those made on other
hines.

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Provision for extra Soundheads. Additional Soundheads
{up to two in number) can be fitted at any future time for dual
channel operation. for stcreophonic sound. for tape moni-
toring. etc.

Fast Re-wind in either direction by switch which auto-
matically lifts pressure pads and withdraws tape from contact
with heads, Full reel of l,200 ft. of tape can he completely
re-wound in 45 seconds.

Coloured Signal Lights indicate visually and automatically
the actual operation taking place and thereby eliminate all
risk of error.

Abridged Specification

Brenell Record/Playback Head
High Impedance. twin track, with operative gap
at top to conform to British Standards.

1,800 ohms at 1 K :5.
16.000 ohms at 10 K cs.
50,000 ohms at 45 K cs.

Bias Frequency: 50 K cs approx.
Optimum Bias Current: 1-0 mA.

Impedance :

Optimum Recording Current:
100 micro Amps,

Brenell Erase Head

Low Impedance, twin track, with operative gap
at top to conform to British Standards.

Erase Frequency: 50 K cs,
Erase Power : 2 to 2-5 watts.
Brenell Hi-Fi Amplifier

Frequency Range :

At 3-} i.p.s. : 606,000 cps 3 db.
At 751- i.p.s.: 6010.000 cps 3 db.
At 15 ip.s.: 5014.000 cps 1 3 db.

Sensitivity :
Microphone: 2-5 mVs into 2 megohms.
Radio or Pick-up: 250 mVs into 700 K ohms.

Output: 4 watts into 15 ohms.

Internal Speaker: 9 X 5" elliptical.

Valve Line up: EF 86. ECC 83, EL 84. EZ 80
EM 81 (or equivalents).

Indicator Lamps: 6-5 volts, 02 amp. MES.

Total Power Consumption : 100 watts.

Working Voltage : 200 250 volts AC 50 cycles
(110 volts AC 60 cycles to order).

Socket I (Input) :
For high impedance Microphone (crystal.
ribbon or moving coil).

Socket 1 (Input) :
For Pick-up. radio or EM. Tuner.

Socket 3 (Output) :
For headphone monitoring or [a feed signal to
external amplifier.

Two Additional Sockets :
Two additional co~axial sockets are provided
on the chassis. one to permit the amplifier
to be permanently connected with a Radio:
Gram input and the other for monitoring and
playback to be effeCted through an extra
amplifying system.

Output Socket (at rear) :
For use with an external loud speaker .115
ohms). Insertion of the plug into the socket
automatically disconnects the internal loud
speaker.

Sole Manufacturers

Brenell Engineering Co. Ltd.

la Doughty Street, London, W.C.l
Telephone : CHAncery 5809 and HOLbarn 7358

Printed in England. 958