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Each items number is also the drawing number.
Telephone-Unit D92732
Used on Telephone No. 746
On later boards T19A, T19b and T2A are only fitted if required by a circuit
diagram
Drawing - 92773
Circuit diagram - SA 10116
Original circuit board
Note modified circuit board with terminal cut outs unused
Capacitor C1 has also been removed - probably used on Plug and Socket
variant
SBM variant - note the simplified rectifier element and lack of capacitors
Mark 1
Mark 3
Mark 4
Telephone-Unit D92744 (Mark 1)
Used on Telephone No. 722
Telephone-Unit D93039 (Mark 1)
Telephone-Unit D93044
Used on Bellset No. 49A
Mark 3 has additional Terminal 19A.
Telephone-Unit D93050
Used on Telephone No. 1/722
Drawing - 93050
Telephone-Unit D93089
Used on Telephone No. 4252
Circuit Board has additional terminal 19A.
Telephone-Unit 1/D93315
Used on Bellset No. 50A & 50C
This board was also miniaturised later in production - probably as a cost
saving exercise.
Drawing - 93315
Telephone-Unit 2/D93315
Used on Bellset No. 50B & 50D
Later
versions had a Terminal B20
Drawing
- 93315
Telephone-Unit D93458 (Mark 1)
Used on Telephone No. 776
Drawing - 93458
Telephone-Unit D93937
Used on Telephone No. 782 Mark 1
Telephone-Unit D93883
Used on Telephone No. 782 Marks 2, 3 and 4
Telephone-Unit D94224
Used on Telephone No. 746C
This circuit board has additional terminals 19A and 19B
and also used a Micro-Circuit D4529
Circuit diagram SA 10219
Telephone-Unit D95204
Use on Telephone No. 756
Mark 1
This is a modified Telephone-Unit D92732 Mark 1.
Mark 2
Mark 4
This is a modified Telephone-Unit D92732 Mark 4.
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