TELEPHONE No. 83XX range

4 Facilities & Apparatus
Issue 1, June 1980


This Ambassador Telephone is similar to the MF model described in TI B4 B0203, but has a tone caller in place of the bell. Additionally on-hook dialling is provided as described in TI B4 B0205.

Uses of the instrument are as for the basic MF New Generation Telephone, except it cannot be used on the ‘B’ ends of Plan 105/7.

It is available with earth recall in stone and mid-grey and with timed DC break recall in stone only.

It can be free standing and shelf or permanently wall mounted.

The engineering description is Telephone 8310.

4 Facilities & Apparatus
Issue 1, June 1980


The MF Ambassador Telephone uses a 16 button keypad including 10 digits and * (star) and # (square) and is suitable for direct exchange lines in exchange areas which have been converted for MF working (using timed DC break recall). Also Plans 1A/4 and ‘B’ ends of Plan 105/7 (but wired as external only). It is also suitable (using earth recall) for PBX extensions using MF signalling systems.

The ME’ Telephone is available with earth recall in yellow, stone, mid-grey and dark-brown; with timed DC break it is only available in stone.

The instrument can be free standing and shelf or permanently wall mounted.

The engineering description is Telephone 8300.

Telephone No. 8304R

Ambassador Telephones were supplied in two different ranges:-
Ambassador Mk Telephone (8200R, 8202R (developed version) and 8220R press button - 10pps signalling and 8300R  MF4 signalling) with 700 type telephone circuitry, Tele 8220R has a 10 address memory.

Ambassador MK2 (Telephone 8204R press button 10pps signalling and 8304R MF4 signalling) with `Statesman' type telephone circuitry.

Both Mark numbers are externally similar but are internally quite different, Ambassador MK2 was marketed as 'Ambassador 2'.
Mk 1 telephones had a Handset No. 16A, identifiable by the earpiece having only three holes in a recess. The Mk 2 (developed version) can be identified by the 'banana' insert in the right hand side of the case. This was to allow the fitting of add-on units (amplifiers etc).

Certain Ambassador MK1 models were available to make up `Ambassador Plus' telephones (by the addition of Facility Handsets) primarily to help meet the needs of some disabled customers.

Incoming calls on all Ambassador telephones are signalled by a bell with a bell off facility, on most models there is also a degree of bell volume control.

Made by:-
TMC Ltd (GNA or TMM)
BTCE Cwmcarn (FWR)

Ambassador telephones are approved as supplied under the following approval numbers:-

Telephone Model Number Approval number PBX approval categories
Tele 8220R S/1000/3/C/020049 2
Tele 8302RR S/l000/3/D/021519 8
Tele 8304R  S/1000/3/E/500057 4
Tele 8200/8202/8204 S/1000/GF/1981 2
Tele 8300/8302 S/1000/GF/1981 4

Approved Handsets 16C, 16D and 16E are approved for use with Telephones 8200R and 8202R.

'Ambassador Plus' telephones with amplified handsets 16C require minimum of 26ma off-hook line current to power the amplifier.

Teles 8220R are line powered and require no external power supplies but contain a line charged battery to power the stored number memory. The battery will draw approx. 1ma from line provided line voltage is not less than 22 Volts, continuous charging is not necessary.

Ambassador Telephones have a Ringer Equivalence Number (REN) of 1.

Ambassador 2 Telephone
Modifications for use in 'C wire supervisory' PMBX extensions.
Tele 8204R - Shift recall switch lead from PLE1+2 to PLE2+3, fit 6 way line cord.
Tele 8304R - Shift recall switch lead from PLE2+3 to PLE3+4, fit 6 way line cord.
Recall switch leads are accessed by removing the line cord cover plate in the base of the telephone. Line jack unit should have recall Earth connected to LJU4 and C wire connected to LJU1.
Diagram for connection of Teles 8200/8202/8300/8302 to 'C' wire supervisory PMBX extensions are in BT Guide Notes (Customer Appts) S10 S0007.

Teles 8220R contain a field replaceable (line charged) battery fitted in a compartment in the telephone are to power the stored number memory. This is supplied in a charged condition with a strip of card between the contacts to prevent discharge whilst not in use, the strip of card should be removed on installation.


Telephone 8204R Mid Grey  411105
Telephone 8204R Brown   411107
Telephone 8304R Brown  877047
Cord Connecting 6/524 (3000mm)   512361
Bracket 20D  436214
Receiver Inset 3/3T (inductive coupler)  877095
Telephone 8200/8202R Brown (without handset) 877048
Telephone 8300/8302R Brown (without handset) 877049
Handset 16C Brown 411037
Handset 16D Brown 411039
Handset 16E Brown  411041
Telephone 8220R Stone   410968
Telephone 8220R Brown  411034
Cord Connecting 4/500 (150mm)  512234
Receiver Inset, 4T     442826
Microphone Inset 21B  877034
Cord Connecting 4/500 (3000mm Line cord)  512233
Cord Connecting 4/503 (Handset cord) 512315
Cord Connecting 4/524 (3000mm Line cord) 512360
Cord Connecting 4/523 (Handset cord)   512359
Battery Secondary, No 33 (for Tele 8220R) 192048
Receiver Inset 2/3T (Inductive coupler) 877095

Idle - Normal capacitor loop.
Seized - Normal Press Button Telephone loop. The diode bridge in the keypad may give high resistance loop test conditions when tested with low voltage testing equipment.

NB: Telephone 8220R contain a line-charged battery, which will charge from line at 1mA provided line voltage is not less than 22 volts, continuous charging is not necessary.
Telephones of GEC (GEN) manufacture require a Battery Dry No. 102 whilst telephones of TMC (GNA) manufacture require a Battery Dry No. 33.

The battery is charged from line by a charge switching circuit that disconnects the battery for approximately 30 seconds whenever line conditions are disturbed, e.g. during line testing.

Ambassador MK1 telephones may be converted locally (by the addition of the appropriate facility handset) to an 'Ambassador Plus' telephone.

Facility handsets are as follows:-
Handset 16C, incorporates a line powered amplifier to increase the volume of incoming speech signals, also includes an 'inductive coupler' receiver inset 2/3T to benefit users of 'inductive coupler' hearing aids.
Handset 16D, incorporates a neon indicator that lights up to incoming ringing signals.
Handset l6E, incorporates a microphone cut-off switch this is normally 'non-locking' but may be made `locking' by removing the switch slider and turning through 180 degrees.

'Ambassador Plus' telephones were not available as ready assembled.

Ambassador 8304 has fairly good immunity to RFI from l00kHz to 200MHz.

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Last revised: January 28, 2020