Author Topic: Norwegian: Elektrisk Bureau 1967  (Read 1462 times)

Offline dsk

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Norwegian: Elektrisk Bureau 1967
« on: November 23, 2014, 01:45:13 AM »
When this one became the only Norwegian standard in 1967, you could get it as a table top, in grey, and you might get a grey plastic "table" to hang on the wall. Youst to choose what you want. ;D

This "ultramodern" electronic EB 1967 was equipped with dynamic transmitter and an amplifier with 2 transistors. Due to the high cost of theese expensive transistors the hoockswitch became extensive, and made it possible to use the transmitter to produce a warbeling beep as a ringing signal.
This model was made until push buttons was introduced as late as 1982.

The rining tone was of a frequency who made it hard to deside witch telephone it came from.

The ren load will vary depending on ringer volume, from about 1.3 to 2.4
« Last Edit: June 18, 2017, 02:36:12 AM by dsk »

Offline LarryInMichigan

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Re: Norwegian: Elektrisk Bureau 1967
« Reply #1 on: November 23, 2014, 11:59:53 AM »
It looks an awful lot like an Ericsson Dialog to me.

Larry

Offline dsk

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Re: Norwegian: Elektrisk Bureau 1967
« Reply #2 on: November 23, 2014, 02:05:07 PM »
Larry that's right, it looks identical, because the plastic parts are made in the "same" mold. EB and LME had a close relationship, and the differences are small.  The receiver cap are different, the dial are different, and the plastic part where the the screw to fasten the cover was transparent in Sweden and same color as the phone in Norway.  The main difference are still the circuit  with transistors, dynamic transmitter element = receiver, and no traditional ringer, or as I said in another thread:

The Ericsson Dialogue telephone was made under licence in many countries. Most countries used identical circuits as the swedish one, and the dial was the same with or without lettering depending on local standards. Of course we could not keep everything as standard here in Norway, so our had different caps on the handset, with dynamic transmitter and receiver elements. (identical elements) The transmitter were also acting as a loudspeaker for the electronic ringer signal. With this setup you needed a totally different circuit so it had a complex hookswitch, and 2 of those new expensive transistors for use as a amplifier of the transmitter. In on-hook position one of the transistors made a howl 2500 Hz mixed with the ringing frequency making a warbling whistle. Of course we had to use another dial with the mechanism equal to what the BTMC or Antwerp telephones used from about 1930-ies. None of these had automatic line compensation, just a resistor and capacitor circuit.


dsk
« Last Edit: June 18, 2017, 02:37:55 AM by dsk »

Offline ma_xyz

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Re: Norwegian: Elektrisk Bureau 1967
« Reply #3 on: July 18, 2018, 04:30:24 AM »
I spend a few weeks in Norway (Narvik). Our hosts, knowing about my "addiction", got a couple of old norwegian phones for me to have something to tinker in case of bad weather - the weather is currently perfect, often sunny and warm - still I found some time to clean up the phones.

One of the phones is a "EB 1967".
It looked very standard from the outside, when I first opened it up I was suprized to not find a ringer - I then found this forum thread which explains everything perfectly - and thanks to another mentioned thread also found the LME Review article about it. A very interesting phone. I cannot test it here, but as everything looks in good shape I assume it would work. Will take it home in a few weeks and test it then.

I have two questions, perhaps anybody knows (perhaps @dsk ?):
- Identifying year of mfg? On the bottom outside of the phone there is printed/stamped: "36 72" - could '72 mean the year of mfg?
- Names for the device?
-- Manufacturer: "EB 1967" or "Dialog"?
-- How did the Norwegian PPT (Televerket?) call it?
-- any Nicknames?

Offline dsk

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Re: Norwegian: Elektrisk Bureau 1967
« Reply #4 on: July 18, 2018, 06:33:19 AM »
This is a 1967 modell Made W 36 1972, shoud work well in US.  REN load depends on volume settings.
( the  dynamic transmitter /receiver capsules was used as diskant elements by some HiFi freaks)
dsk
« Last Edit: July 18, 2018, 06:36:55 AM by dsk »

Offline ma_xyz

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Re: Norwegian: Elektrisk Bureau 1967
« Reply #5 on: July 18, 2018, 02:23:41 PM »
Thanks for the info. And the interesting tidbits about HiFi use!
My "homebase" is Switzerland but I'm confident that it will work as well :-)
Michael