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
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 (shown to the right). 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
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.
GEC Ltd (GEN)
TMC Ltd (GNA or TMM)
BTCE Cwmcarn (FWR)
Ambassador telephones are approved as supplied under the following approval numbers:-
|Telephone Model Number
PBX approval categories
Approved Handsets 16C, 16D and 16E are approved for use with Telephones 8200R and
'Ambassador Plus' telephones with amplified handsets 16C require minimum of 26ma off-hook
line current to power the amplifier.
Telephones 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
approximately 1ma from
line provided line voltage is not less than 22 Volts, continuous charging is not
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
Diagram for connection of Teles 8200/8202/8300/8302 to `C' wire supervisory PMBX
extensions are in BT Guide Notes (Customer Appts) S10 S0007.
Telephones 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.
||BT ITEM CODE
|Telephone 8204R Mid Grey
|Telephone 8204R Brown
|Telephone 8304R Brown
|Cord Connecting 6/524 (3000mm)
|Receiver Inset 3/3T (inductive coupler)
|Telephone 8200/8202R Brown (without handset)
|Telephone 8300/8302R Brown (without handset)
|Handset 16C Brown
|Handset 16D Brown
|Handset 16E Brown
|Telephone 8220R Stone
|Telephone 8220R Brown
|Cord Connecting 4/500 (150mm)
|Receiver Inset, 4T
|Microphone Inset 21B
|Cord Connecting 4/500 (3000mm Line cord)
|Cord Connecting 4/503 (Handset cord)
|Cord Connecting 4/524 (3000mm Line cord)
|Cord Connecting 4/523 (Handset cord)
|Battery Secondary, No 33 (for Tele 8220R)
|Receiver Inset 2/3T (Inductive coupler)
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
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.
B MARKETING COMMERCIAL
4 Facilities & Apparatus
Issue 1, June 1980
SELF CONTAINED WITH TONE CALLER AND ON-HOOK DIALLING
This Ambassador Telephone is similar to the SC model described in TI
B4 B0202 but has a tone caller in place of the bell, which also acts as a waiting amplifier/transducer.
on-hook dialling is provided. With the handset at rest, the line is seized by pressing the button marked
'S' (send), the required number can then be keyed. A lamp indicates that the facility is in use and the progress of the call is monitored by means of a waiting amplifier situated in the base of the instrument. As soon as the call is answered, the caller lifts the handset in the normal way, automatically disconnecting the ‘amplifier’ which can be reactivated by further depressing the
'S' button thereby disconnecting the handset. When the handset is off hook, the amplifier is connected and/or disconnected by a single depression of the
'S' button. To clear, the handset is replaced or the 'S' button is depressed if the amplifier is in the live mode.
Uses of the instrument are as for the basic SC New Generation Telephone except it cannot be used on the ‘B’ ends of Plan
This instrument is available in stone, mid-grey and dark-brown.
It can be free standing and shelf or permanently wall mounted.
The engineering description is Telephone No. 8210.