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Phones PTT T65-TDK →
Subscribers were never the owner of the device, as it could only be rented
from the Dutch PTT. The letter 'T' in the model number means Tafeltoestel
(table device). The basic model was grey
and was made of unbreakable ABS plastic.
It was designed by the German manufacturer Krone.
The device greatly resembles the
standard table telephone set of the German Bundespost,
the FeTAp-61, 1 that had been
introduced in 1961.
Not only are the basic colour and other details very
similar, the dimensions are nearly identical.
As a result, the handsets are interchangeable.
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The T65 was in production from 1965 to 1987. Millions of units were
manufactured by Ericsson,
Heemaf, Standard Electric (later NSEM)
and Krone. From 1974, the T65 was also available with DTMF push-buttons –
known as the T65-TDK 2 –
but these could not be used everywhere, as the switches in
several parts of the Netherlands had not yet been replaced by DTMF ones.
The wall-mount variant of the T65 was the W65, and a version for integration
in a desk was known as I65.
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FeTAp = Fernsprech-Tisch-Apparat (telephone table device).
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TDK = Toon-Druktoets-Keuze (touch-tone dialling).
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T65 Table model W65 Wall-mount version I65 Version for integration in a desk S65 Series Device (for local multi-extension setup) T65-SE5 Semi-Electronic system version T65-LB Local Battery with inductor instead of dial T65-TDK DTMF version
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- Earth button
Initially, the T65 was available with and without an Earth-button,
that connected the A-wire of the telehone line briefly to ground,
to pass a call to the (optional) PABX. From 1973 onwards,
the earth-button was present on all T65 units.
- Colour
The initial colour was (green-ish) grey with a cream bottom, dial and
other details. In the 1970s, the phone also became available in a variety
of colours, including red, green, white, brown, blue and orange,
some of which are very rare today.
- Lock
A lock could be added – in the front left corner – to block outgoing
calls. It shorted the contacts of the dial, and
incoming calls could be answered as usual. Despite the lock, outgoing
calls were still possible by tapping the hook switch in the correct
rythm.
- Volume control
Handsets were available with an integrated knurled knob, that could
be used to adjust the volume of the additional built-in amplifier.
- Microphone amplifier
An additional microphone amplifier could be added for people with a
soft voice. It had to be enabled with a small black slide switch at
the rear of the handset. This option is rare.
- Mute button
Handsets were available with a push-button that disconnected the
microphone as long as the button was depressed. It was
located at the same place as the volume control (above).
The green variant of this option was also used on the
NATO KF 4-2 voice terminal.
- Noise-cancelling microphone
For use in noisy environments, such as aboard ships and in military
bunkers, a special
noice-cancelling microphone
was available. It was
fitted instead of the regular microphone and was slightly thicker.
- TDK unit
From 1974 onwards, a circular DTMF unit was available that could be
used to convert existing T65 sets (and particularly the wall-mount W65
and the integrated I65)
from pulse dialling to DTMF dialling.
TDK means Toon-Druktoets-Keuze (touch tone dialling).
- GDK unit
This option was similar to the TDK unit above, but used a different
dialling system based on DC voltages. It was used by some PABX units
made by Philips, and is extremely rare. GDK means
Gelijkstroom-Druktoets-Keuze
(direct current push-button dialling) [3].
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For the conversion of standard T65 telephone sets
to touch-tone dialling,
circular DTMF units were made by Ericsson.
These were particularly useful for the W65 and I65 models, which were not
available in a DTMF variant as standard.
It has the same form factor as the old interruptor (pulse) dial, so that it
could be retrofitted to any existing T65, regardless
the manafucturer.
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Red a Line (A) Blue b Line (B) Green E Earth (ground) Yellow EB Extra bell (strapped to b in wall socket)
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Red T Speaker (1) Blue T Speaker (2) Yellow M Microphone (1) Green M Micriphone (2)
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Below is the pinout of a Dutch analogue subscriber line, as endorsed
by the (then) state monopolist PTT. This is the pinout when looking
into the wall socket, which is the same as looking at the screw terminals
inside the instrument's plug (shown here). When no external bell is connected,
a wire strap should be placed in the wall socket, between the B and EB contacts.
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a Subscriber line (A) red b Subscriber line (B) blue EB External bell (normally strapped to b) 1 GND Ground
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The (EB) terminal is normally strapped to (b) terminal inside the
wall socket. It is removed when an external bell set is connected to
these terminals. If the phone doesn't ring, check whether
this strap is present.
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- Ericsson
- Heemaf
- ITT
- Krone
- Siemens
- Standard Electric (later NSEM)
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© Crypto Museum. Created: Thursday 30 March 2017. Last changed: Monday, 15 January 2024 - 16:18 CET.
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