Need help to identify a EMI limitter ?

[Batkiss]

Can someone to tell me what this is

[mjrippe]

Not sure what it is but it is not a limiter. Some sort of control panel or test piece ("Intermitency Check"). Also has a buzzer switch, maybe it is for an intercom system?

[Batkiss]

What is intercom ? It has output transformers and l63 tubes for amplifing

[Batkiss]

Is that intermittency like compres ?

[mjrippe]

An intermittent signal is a signal that turns on and off, but not in a regular pattern. Like a bad connection where you move the wire and the sound comes and goes.

An intercom is a communications device that can be used to talk between different parts of a building. Sometimes used as a door buzzer.

Without seeing more of this piece it is impossible to tell what it is. Do you know what the writing under the connectors at the bottom says?

[Jazz Noise]

Looks like a set of amplifiers. Maybe pre-amps, maybe for monitoring. Can't understand why there's THREE of them, though.

[Bill@WelcomeHome]

Doesn't look like a recording piece to me at all. (12as as power tubes?)

[mjrippe]

Originally Posted by Bill@WelcomeHome

Doesn't look like a recording piece to me at all. (12as as power tubes?)

Are you guys seeing a photo I'm not? All I get is a front panel. No tubes or other details...

[Bill@WelcomeHome]

Originally Posted by mjrippe

Are you guys seeing a photo I'm not? All I get is a front panel. No tubes or other details...

"It has output transformers and l63 tubes for amplifing..."

[Batkiss]

Front panel connectors are signal and rec'r output.
New pics rear and bottom

[Batkiss]

Intermittent is like on off function intermittency like compensation
Am i right ?

[Studerfreak]

Could be a monitor unit that checks if there is an audio signal present.
As used for checking the audio lines to a transmitter to see if there was no silence transmitted.
The outputs may suggest that the lines could be recorded, for logging purposes maybe.
If one of the inputs did not detect audio for a specified time a buzzer could alert the engineer.
The signal lights may have displayed "audio present" and "no audio" on each channel.
The switch "intermittency check" probably internally muted all of the three input channels to check if the signal "no audio" was displayed.


Just a suggestion...

[Batkiss]

Could be like a mixer whit a gate hope that i get soon those missing l63 tubes.

[Studerfreak]

I see nothing to mix on that front panel.

I still feel about a "signal present" monitor unit.
The pots could be to set the input audio level, eventually making one of the two signal lights above the pot to light as an indication that there is a signal present.
One can see then on each input that there is audio.
When on a channel the audio is muted or not present, the other lamps lights and, depending on the BUZZER switched on or off, also gives an audio signal.

Mixers normally have a number of inputs and less outputs.
What I can see on the photograph is just three seperate channels.
And what would the use of a buzzer be if it was a gate ??

[Batkiss]

Type is QD 231 if that help anything.

[narcoman]

Originally Posted by Studerfreak

Could be a monitor unit that checks if there is an audio signal present.
As used for checking the audio lines to a transmitter to see if there was no silence transmitted.
The outputs may suggest that the lines could be recorded, for logging purposes maybe.
If one of the inputs did not detect audio for a specified time a buzzer could alert the engineer.
The signal lights may have displayed "audio present" and "no audio" on each channel.
The switch "intermittency check" probably internally muted all of the three input channels to check if the signal "no audio" was displayed.


Just a suggestion...

I think that is exactly what it is...... as used by the beeb for live signals. Connected to audio, but not an "audio device" itself. Seen similar looking box used in radio to indicate whether a transmission was active or not.

[Studerfreak]

Nice to see Narcoman on the same wavelength....

Have you seen this: http://www.worthpoint.com/worthopedi...atic-161287591

[Batkiss]

Could be so , but why it has l63 tubes for amplifing ?

[Studerfreak]

Maybe because they had lots of these lying around.
Or they needed a quite common triode tube for 4v heater voltage.
Can you see if the unit was AC powered or DC (batteries) ?
That could explain the 4 volts heater voltage.
If it really was a line monitoring unit I could assume the thing would work on AC, but also could continue monitoring (and alert) when the AC power broke down.

As far as I know the production of the 163 valves stopped in 1938.

[Batkiss]

It is not 163 tube. It is L63 same as 6J5G and it run dc power

[Batkiss]

Sorry not DC. It runs AC power

[narcoman]

Originally Posted by Batkiss

Could be so , but why it has l63 tubes for amplifing ?

so that it's a monitor with distribution trying to not affect the signal?

[Batkiss]

Maybe it is bbc radio transmitting monitoring device around 1940's
Becouse thoes connectors and H63
Tubes.

[Studerfreak]

Originally Posted by Batkiss

Maybe it is bbc radio transmitting monitoring device around 1940's
Becouse thoes connectors and H63
Tubes.

That conclusion was already made early in the first 16 replies.
Nice that you are also with us now.

[narcoman]

hahaha