Identifying some CCCP Transformers

[induzer]

Hi there,

I just bought a display unit with nixies for a short wave transceiver set for telex recon from formerly CCCP.
Before I take it apart, using it as desk clock, I record the schematics. The unit seems to be rarely documented.

All is recorded so far, but the power supply. It uses self oscillating circuits for its 2 power rails.

Sadly the 2 transformes are perfectly potted, and I haven't a clue how the inductors are arranged inside.


... Someone an idea ?


Cheers,
induzer

[SeanB]

I assume the 2 transformers are not the same part, so pins 1 and 2 are the primary winding on the top one. Pins 6 and 7 are the feedback winding, and pin 6 is the other side of the feedback  winding for regulation. Pin 7 is a common on the secondary, and it is part tapped at pin 8 for voltage sense and pin 3 is the high voltage winding.

Bottom one pins 1 and 2 are primary again, pin 5 is the common for the secondaries, and feedback is from pins 4 and 3. Secondary is pin 5 and 6, with voltage there used to regulate the oscillation on the transformer.

Bottom one i guess supplies 5V at around 1A, top is 160v at 10mA or so.

[exe]

Do you have photos of these transformers? There should be some marking...

[induzer]

...some photos

[exe]

I didn't find anything about the transformers. Can you please show photo of front panel with logo and model name?

[induzer]

Its the third module from the top.
The type is R1250 M/B

Manufactured by ML - Mechanikai Laboratórium, Budapest.

http://militaermuseum-anhalt.de/images/stories/SpezAkltechnik/Steckbriefe/R1250/r1250-001.jpg

[Bud]

Holy cow  , did you get the whole station or just the nixie module?

[induzer]

  ... regretfully only the nixie module 

[Frank65]

Hallo,
ich habe in deinem Blog von 2019 Nixiclock - greeting from UdSSR gelesen, dass du dich mit dem Nixon Einschub aus dem Empfangsgestell R-1250M-1 beschäftigt hast. Ich suche für diesen Einschub dringend die Schaltungsunterlagen.
Kannst du mir helfen?
Vy73 de Frank