GPO 746 Rotary 1970s-Style Retro Landline Telephone, Classic Telephone with Ringer On/Off Switch, Curly Cord, Authentic Bell Ring for Home, Hotels- Black

Product Information

The telephones, as issued, have the aperture for the press-button(s) closed with a dummy button held in place by a clip. When a press-button unit is fitted the dummy button and clip should be secured within the telephone for subsequent refitting. This was a 746 type telephone which could transmit MF4 signalling, also known as DTMF touch tones. These telephones could only operate to exchanges that could deal with MF4 but they were used on PABX systems that used MF4 for internal calls from the 1970s. The TXE1 exchange could handle MF4 calls as early as the late 1960s. This was however a unique prototype exchange, which served customers in Leighton Buzzard: otherwise customers did not have access to MF4 capable exchanges until later models of the TXE4 system came into service in the late 1980s. The regulator is an integral part of the telephone circuit and provision is not made to render it inoperative. The main instrument could make and answer exchange calls, talk to and transfer calls to the extension(s). The extensions could call and talk to each other and the main instrument, but could only make external calls if a request to the "operator" at the main instrument, for the exchange line to be switched to the extension was honoured. telephone and telegraph networks until 1982, when the first carrier was licensed in competition with the new British Telecom

The original Trimphone was the 712 however it took a number of revisions to get right and a much improved model, the 722 came along in 1966 and was released as the 1/722 with a revised version, the 1/722 MOD, following swiftly on its heels. A further improved version, the 2/722, then became the standard issue in late 1971. With the advent of new style wiring the model numbers were prefixed with an '8' and were fitted with a 4000Ω high impedance ringer and a new style line cord fitted with a 431A plug. Push-button models were introduced in the 70s and the final version of the Trimphone was the Phoenix phone, available in a range of new colours known as The Snowdon Collection which came in out 1982. These were 700 type updates on the HTS 1 and HES 1 respectively. On both systems the main improvement over their predecessors was that the rows of call buttons were now arranged transversely instead of longitudinally. This meant that the basic 706 case styling only needed to be stretched forwards by 3inches instead of 8 as previously, on the HES. This looked neater and took up less space. Otherwise, both of these systems had the same facilities as their 300 type counterparts.Nos. 740 and 746 shows one change from that of the Telephone No. 706. The brown wire from dial terminal D3 is taken to telephone terminal T3 instead of gravity spring 5. This short-circuits the transmitter when the dial is taken off-normal and prevents surges in the spark quench circuit passing through the transmitter. The Tele. 232 came out of the box fitted with a base plate containing a drawer, holding a personal directory card. The telephone could then be screwed directly onto the matching Bell set 26, making a true, but very heavy, telephone set, or screwed down onto the desk of a CCB (coin collecting box), in a Public Telephone Kiosk. In this form it was fitted with a modified dial, a more durable handset cord, and was re-numbered as the Tele. 242. There was one other variant. With modified internals and designed purely to be used in combination with a Bellset 39a or 44, this was the Tele. 248 in the guise of the Extension Plans 5 & 7. This type of telephone is often featured in British made period television dramas. Curiously, the telephone often rings despite not being fitted with any bell unit. No. 746 is fitted by removing the dummy button and clip and inserting a Part 1/ or 2/DBU/362 which is retained by two pins, Parts 1/DPI/203. When two press-buttons are required, two Parts 1/ ... 6/DBU/363 are fitted, each with one Part 1/DPI/203. This was the GPO's first attempt at a compact, supervised extension plan, for small businesses. The Plan 5 had 2 extensions plus the control station, the Plan 7 had only 1.These instruments were manufactured for the BPO by GEC.

one hundred and fifty year period the GPO released a huge amount of memorable and sturdy phones designed for everyday use which were eventually discontinued as the company was turned into a private corporation in the 1980s and technology

GPO 746 Wallphone - Product Info

The GPO (General Post Office) was created by Oliver Cromwell's Parliament in 1657, which declared: 'There shall be one Power for intercommunication signalling and speech circuits between the main instrument and the extension, when not on an exchange call, was provided by dry cell batteries at the main instrument. In practice the unit was normally left in circuit. The downside of this plugin module was that if the telephone was dropped or mishandled the regulator board would become loose and fall out and cause the telephone to stop working until it was replaced by a technician. Compare this with the inside of a 746 where the regulator was integrated into the main circuit board. These were updated versions of the 200 type plans 5 and 7 but based on the 700 type telephone. It had a master station which was a 700 type telephone mounted on a plinth with buttons, 'The Planset 625'. The master station and the extension stations could call and speak to each other and also handle and transfer outside calls. The difference between a Plan 105 and Plan 107 was that the latter had only one extension; the former had two. On plans with the 'A' suffix, conversation between the extension and the exchange was private against the planset. On a Plan 107 both of the long buttons, on the front of the Planset 625, were connected together. Pressing either would 'buzz' the single extension. The telephones, which as issued are for use in automatic areas only, are suitable for use on lines of up to 1000 ohms T.E.R.