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Author Topic: What is the application for a high inductance low current choke?  (Read 2687 times)
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W8ACR
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« on: December 05, 2012, 08:10:23 AM »
What is the application of a 250Hy, 15mA choke?

Ron W8ACR
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K3YA
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« Reply #1 on: December 05, 2012, 08:42:40 AM »
Audiophiles have used them for interstate coupling in single ended triode amplifiers or possibly output of a preamp.
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« Reply #2 on: December 05, 2012, 10:51:16 AM »
Lots were used in regenerative receivers as decouplers.

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W2PFY
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« Reply #3 on: December 05, 2012, 02:45:20 PM »
Quote
What is the application of a 250Hy, 15mA choke?

As a matter of factor, in at least one application RCA used chokes like yours in their 1 KW AM rig.

My Westinghouse MW-2 speech amplifier/driver uses four 100 Henry chokes. Two are in the first voltage amplifier in the plate circuit and two are in the cathode circuit to drive a pair of 833A tubes. The voltage amplifier and cathode follower are (4) 807 yubes. It would be interesting to me if a side by side test were made, would the inductors produce a better audio waveform over an rc circuit? My guess would be that most pre 1940 BC transmitters would have uses inductors over RC circuits most of the time.
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Patrick J. / KD5OEI
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« Reply #4 on: December 05, 2012, 11:52:55 PM »
A 750H 1mA one was removed from a military scope. It has 10KV insulation.
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« Reply #5 on: December 06, 2012, 08:05:06 AM »
They have been in regens since the 20's and Ive seen in some early HP and other audio test gear.
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