- 3 -
~1
OBSOLESCENT.
~1/24
Telephone Headset Amplifier used in Foreign Commentators'
Control Units. Gain: 40dB. Printed circuit board 51mm x
48mm. SCPD 1967. OBSOLESCENT.
~1/25
Pickup Amplifier used with Decca pickup in DRD/5. Z in:
2Mn. Z out: soon. Minimum loss: 24dB at 1kHz with gain
control at maximum. Mounted in Eddystone box 650.
DD 1967. OBSOLESCENT.
AM1/26
Tuned Amplifier used in C06/504 to drive the power
amplifier for the oven supply in the field delay system.
Printed board with transformer, 102mm x 152mm x 152mm.
DD 1968. WITHDRAWN.
~1/27
Line and PFL Amplifier used in RP2/6 with Go1dring G800
stereo pickup. Includes: line amplifier with 30dB gain
into 600n, input impedance 45kn; pre-fade listen
amplifier, 18dB gain, for feeding high impedance phones.
BBC/ISEP, 25 way plug, coding positions 3, 19, 23.
DD 1968. DD Spec 1.69. DDHB 1.54. ACO. OBSOLESCENT.
AM1/28
Filter Amplifiers used in RP2/6 with Go1dring G800 stereo
pickup. Includes rumble filter, switched top-cut and RSA
filters. Gain: 14dB into 10kn. Z in: 50kn. All controls
are external. Also provides 600n feed for a PFL
amplifier. BBC/ISEP, 25 way plug, coding positions 73, 7,
11. DD 1968. DD Spec 1.70. ACO. OBSOLESCENT.
~1/29
Monitor Amplifier used in PA6/57.
into
15n
loudspeaker
and
high
BBC/ISEP, 25 way plug, coding
DDMI 1.54. ACO. OBSOLESCENT.
Gain: 60dB. Output: 2W
impedance headphones.
3, 5, 23. DD 1965.
~1/30
Tuned 100kHz Power Amplifier used in BTR/2 Magnetic
Recorder. Includes 2 power amplifiers, driven by OS2/34
each supplying a 7mH record head and a 1.8mH erase head.
CH1/18C. DD 1968. CANCELLED.
~1/31
Tuned 100kHz Power Amplifier used on RD4/4 Magnetic
Recorder. Comprises two power amplifiers, driven by
OS2/37, each capable of supplying a 7mH recording head or
a 1.8mH erase head. One amplifier has a single pre-set
input level control and the other has two pre-set
controls, relay-selected for two tape speeds. BBC/ISEP,
25 way plug, coding positions 3, 9, 15. DD 1969.
DD Spec 1.79. DDTM 1.62. ACO. OBSOLESCENT.
~1/32
Erase and Bias Current Measuring Amplifier for measuring
erase and bias currents on a 1mA meter. PCB for mounting
across meter
terminals.
DD 1969.
DD Spec 1.87.
ACO.
OBSOLESCENT.
~1/33
Clean-feed Amplifier First used BH Continuity.
DD 1969. OBSOLESCENT.
CH1/12.
~1/34
P.A. Processing Amplifier for preventing howl round on

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