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Old 7th October 2005, 09:14 PM   #1
planet10 is offline planet10  Canada
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Mystery Chokes
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I got given these chokes (2 the same) -- they are substantial, have the sound of liquid sloshing around in them when you shake them (they fellow who gave them to me said oil filled), are rated for very low inductance, but large current capacity.

Can anyone enlighten me as to their purpose?

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Old 7th October 2005, 09:15 PM   #2
planet10 is offline planet10  Canada
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And a picture of the choke...
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Old 7th October 2005, 09:27 PM   #3
SY is offline SY  United States
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If these are old, that's probably PCB inside...

If I were to guess, these were made for filament or heater supplies.
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Old 8th October 2005, 12:25 AM   #4
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Nice stuff.

Considering the apparent age it probably does use PCBs but as long as it stays sealed it's safe (even if it doesn't, its reactivity is debatable so there ).

0.11H is around the critical value for say 300V 1A, so that makes enough sense. No good for less than that critical value, but...

It may've also been used at lower voltage for consequently wider current range, but I don't know anything tubed that would need that kind of power. Could also be early transistor era, but I doubt they would've needed parameters like that with 50s and 60s germanium junk as it was.

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Old 8th October 2005, 05:29 AM   #5
dhaen is offline dhaen  Europe
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Add 12uF in parallel for a 120 Hz resonator. Connect in series with your DC DHT heaters to reduce hum.

NB Check my math, it's always suspect
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Old 12th October 2005, 01:37 AM   #6
JesseG is offline JesseG  Canada
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Hey Dave:

I tracked down those chokes - they are filled with PCB. They came from the transmitting stage of the Coastguard radio station here in Alert Bay. Westinghouse 20,000 watt HF (240 Khz) transmitter ca. 1940. Removed July 1967.

Same with the trafor and chokes I have - these came from the audio amplifier section (shame this was lost) - it drove about 18 speakers around the site on 75V step-up-down trafors on the speakers (remember the highschool PA system).

Now, you just have to figure out what to use them for.

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