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Strange AC current source..("variator"????)
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Circlotron:
I’d say they were trying to regulate the valve heater voltage and the easiest way to do that back in the day was to regulate the current, and as a consequence the voltage was more or less regulated. Modern solution is simply regulate the voltage.
Pawelr98:
You can still buy NOS barretters.
Over here they cost 5-20PLN or (with current exchange of 3.75PLN/USD) 1.3-5.3USD each.
Depends on model.
Since Poland is next to Slovakia you may find similar stuff in your country or talk with sellers to send it to Slovakia.

The problem is finding one which directly replaces your device.
Mostly 1A ones are avaiable.
Perhaps you could put together a working thing using such 1A barretteralong with parallel resistor to bump the current.
Or parallel a 1A barretter with 400mA one. It's possible to find a pair of such devices.

Running a modern day regulator shouldn't be a big problem.
Others have already mentioned the regulated DC way.
Since barretter already "eats" couple volts anyway there's already sufficient headroom for a regulator.

You could do either constant voltage or constant current.
Constant current would be easier since we already know the value to be at precisely 1.4A.
Default resistor network will do the rest.
SK_Caterpilar_SK:
That would be the best solution. Were technically neighbours so where can I buy it? Cause on ebay its unobtanium and very...VEEEERY expensive.. Narva 6-9 V 1,4A.
Pawelr98:
Search on "Allegro" under the name "bareter".

I could even find those on a flea market.
Bit more expensive but still cheap.

The best solution would still be the DC semiconductor-based regulator.
Barretters have a limited lifespan.
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