SWITCH, INDICATOR and KEY


 

Switch, Indicator and Key N601
A wooden cabinet comprising of one key, two indicators, a buzzer and a bell.

Used on Extension Plan No. 8A.  Two telephones were associated with this plan, one with each exchange line.  The switch unit had a single telephone for connecting to each of the lines.  The single telephone is unable to listen in to a call in progress thus affording secrecy.  One line had the buzzer as the calling device and the other line the bell.

Includes:-
1 x Bell No. 56A.
1 x Block, Terminal No. 20/14 Blk.
1 x Buzzer, No. 24A (modified).
2 x Capacitors, M.C. No. 102.
1 x Label No. 260 (engraved).
5' x Cordage, Instrument No. 12/F, Brown.
1 x Cover No. 5.
1 x Handle, Key No. 1, Black.
2 x Indicators No. 3300B.
1 x Key No. 212.
1 x Label No. 260 (engraved).

Introduced circa 1938.

Wiring diagram - N601.

Drawing - 63445 & 63437

 

Switch, Indicator and Key N1612 10/10
For Multiphone phone working over ten private wires.  The unit contains a Potentiometer No. 8A, Buzzer No. 18A, two connect circuits and two ring keys.

Wiring diagrams - N1612, N1613, N1615 and for new work N1627.

 

Switch, Indicator and Key N1617 10/10
For concentrating 10 automatic or C.B. exchange lines or extensions or P.W.s and 3 operator's circuits for distribution of press news.

Includes:-

1 x Buzzer No. 18A.
10 x Capacitors, M.C. No. 101.
1 x Case, Switch and Indicator D 9735 (Mk. 3).
6 x Handles, Key No. 1, Black.
4 x Handles, Key No. 1, Green.
3 x Handles, Key No. 1, Red.
10 x Indicators No. 3300A.
3 x Keys No. 68.
10 x Keys No. 264.
1 x Key-mountings KE.
1 x Key-mountings KAF.
1 x Mounting No. 130/10A.
10 x Resistor, Coil No. 12 - 100R.
1 x Strip, Designation No. 8B.


To be requisitioned rep:-
1 x Case, Coil and Capacitor N1616 3+1/4
1 x Switch, Indicator and Key, N1619 (when reqd.)

Superseded by U.A.A. SA9152 in conjunction with Key and Lamp-units No. 2A.

Wiring diagram - N1617.

Drawing - 60598

 

Switch, Indicator and Key N1619 3+1/4
Wooden cased key unit for concentrating 3 automatic or C.B. exch. lines and 1 extension.  Provides positive clearing when an exchange line is connected to the extension.  Used with Switch, Indicator and Key N1617 10/10.

Includes:-
1 x Capacitor, M.C. No. 102.
1 x Clip No. 20B.
1 x Indicator No. 3300A.
1 x Key No. 228.
2 x Keys No. 236, 1 x  Green and 1 x Grey.
2 x Key-mountings N.
1 x Key-mountings PS.
4 x Labels No. 239, White.
1 x Relay No. 303A.
1 x Resistor, Coil No. 12 - 80R.

Wiring diagram - N1619.

 

Switch, Indicator and Key N1636 1/1
Wooden cased key unit for use instead of bell-set to receive calls and connect line to operators set.  For terminating one automatic or C.B. exchange line or P.B.X. Extension where guard lamp is reqd.

Includes:-
1 x Capacitor, M.C. No. 101.
1 x Clip No. 20.
1 x Coil, Induction No.27.
1 x Coil, Retardation No. 3416.
1 x Indicator No. 3300A.
1 x Jack, Lamp No. 47.
1 x Key No. 73, Black.
1 x Key-mountings N.
1 x Labels No. 164.

Wiring diagram - N1636

Drawing - 90580

 

Switch, Indicator and Key N1659 5/5
For terminating up to 5 exchange lines with two answering Inst.  Mahogany cased key unit for use on Installation Controls.  Uses an Indicator No. 3100A2 to indicate line in use.  Two lines can be switched through to two answering machines.

Introduced circa 1937.

Wiring diagram - N1659.

Drawing - 63403

 

Switch, Indicator and Key CB2023 1/1
Single line key unit for use instead of bell-set to receive calls and connect line to operator's set.  For terminating one automatic, or

C.B. exch. line or P.B.X. extension.


Includes:-
2 x Capacitor, M.C. No. 101.
1 x Clip No. 20B.
1 x Coil, Induction No. 27.
1 x Coil, Retardation No. 3416.
1 x Indicator No. 3300A.
1 x Key No. 207, Black.
1 x Key-mounting N

Drawings - 60724 & 60725

Wiring diagrams - CB2023 and N1621

 

Switch, Indicator and Key CB2024 10/10
Wooden cased key unit with Buzzer for terminating ten exchange lines, PBX extensions or PW's.

Includes:-
10 x Capacitor M.C. No. 102.
10 x Indicator No. 2200A.
3 x Key No. 68, Black.
10 x Key No. 215 (3 x black, 3 x red and 4 x green).
1 x Key-mounting KE.
1 x Key-mounting KY.
1 x Label No. 164.
1 x Resistor Coil No. 12 - 1000ohms.
1 x Buzzer No. 18A.

Introduced circa 1937.

Wiring diagram - CB2024.

Drawing - 60731.

 

Switch, Indicator and Key CB2057 8+2/10
10 line wooden key unit.

Includes:-
8 x Capacitor, M.C. No. 101.
1 x Clip No. 24.
8 x Indicator No. 3300A.
2 x Indicator No. 3300B.
1 x Key No. 68, Blk.
1 x Key No. 174 black.
2 x Key No. 208 Yellow.
8 x Key No. 215.
1 x Key-mountings KE.
1 x Key-mountings KY.
1 x Buzzer No. 18A.

Wiring diagram - CB2057

Drawing - 60631

Introduced circa 1936.

 

Switch, Indicator and Key TL2207
Termination of one private wire by the Exchange Telegraph Company Ltd and similar organisations.  Has a potentiometer fitted to control side tone.  A Switch Foot No. 1 can also be connected to unit to mute the line.  A hand generator or ringing lead is also connected and this is for signalling to the other end of the circuit.

Includes:-
1 Bracket, Mounting BY.
1 Capacitor, M.C. No. 100.
2 Capacitor, M.C. No. 102.
1 Clip No. 20E.
1 Coil, Induction No. 3/16.
1 Coil, Retardation No. 3416.
1 Indicator No. 2200A.
1 Key No. 174, Black.
1 Key-mounting N.
1 Potentiometer No. 8B.
1 Resistor, Coil No. 12 - 600R.

Introduced circa 1937.

Wiring diagram - N1620.

Drawing - 60724 & 60725

 

Switch, Indicator and Key TL2208
Termination of ten private wires with supervisory indicators and Multiphone working.

 

 

 
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Last revised: December 18, 2021

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