Carl WA1KPD
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« on: November 28, 2014, 10:59:51 PM » |
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I am cleaning up the junk boxes and have come across several items that look like smaller 2" X 2.5" tube era power supply chokes. But they have 3 wires, all coming out of one side. Leads on one are yellow, red and blue.
Any ideas what they are?
Carl
/KPD
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Carl
"Okay, gang are you ready to play radio? Are you ready to shuffle off the mortal coil of mediocrity? I am if you are." Shepherd
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Pete, WA2CWA
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CQ CQ CONTEST
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« Reply #1 on: November 29, 2014, 01:47:49 AM » |
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Sounds like a TV vertical output transformer.  |
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Pete, WA2CWA - "A Cluttered Desk is a Sign of Genius"
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KA2DZT
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« Reply #2 on: November 29, 2014, 02:37:04 AM » |
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I agree, vertical output xfmrs, never been able to find a use or them.
Fred
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W3RSW
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Rick & "Roosevelt"
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« Reply #3 on: November 29, 2014, 08:09:00 AM » |
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What's the impedance of the most turned windings? Used for an audio choke in a regen? Or if impedance is too low used as a choke ignoring the tap?
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RICK *W3RSW*
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w4bfs
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« Reply #4 on: November 29, 2014, 02:14:59 PM » |
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I have used VOTs as supply filters ... worked ok at 100mA or so
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Beefus
O would some power the gift give us
to see ourselves as others see us.
It would from many blunders free us. Robert Burns
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WZ1M
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« Reply #5 on: November 30, 2014, 02:52:14 AM » |
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Altec/Peerless used a taped choke in some of there units. I just rewound one.
Regards,
TRS
Gary
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KA2DZT
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« Reply #6 on: November 30, 2014, 04:07:16 AM » |
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UTC made three terminal chokes. They are the PA series chokes. Main portion of the choke is the second and third terminal. The first terminal had a 1mfd cap to ground. Some sort of resonating the choke.
Fred
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W2PFY
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« Reply #7 on: November 30, 2014, 06:03:00 PM » |
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What about using them as a mod transformer in a single ended class A arrangement with one lead acting as an auto transformer connected to the PA? Maybe a five watt rig for ten meters?
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Patrick J. / KD5OEI
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« Reply #8 on: November 30, 2014, 09:03:51 PM » |
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The ratio is such that the 'secondary' would be too high for a speaker and too low for much else, although use is possible for a 'line' or where a large voltage signal is wanted but not as much as on the plate. Look for 45-200 Ohms when hooked to a 6V6 or something. Deflection yokes vary wildly so it is hard to say what Z ratio unless you measure.
It might be used as a modder, if you have a step-up with the low Z winding on top. Question is how much DC can pass before the audio-like characteristics go bad?
Use one for an audio choke to supply DC to the class C stage and one just the same for the modulator, and another as the mod transformer with capacitive coupling. Looks like a nightmare waiting.
The things have good HV insulation since they handle a vertical retrace pulse that can be 500-1200V, and work at 60Hz, and even lower, if one has a vertical hold control on the TV set. They are not so good at high audio frequencies, kind of purpose made.
Whatever it is, the thing is a well made autotransformer and you have to use your imagination to find a use. small B+ choke is not a bad use.
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Patrick J. / KD5OEI
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« Reply #9 on: November 30, 2014, 09:06:39 PM » |
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BTW color code:
yellow: vertical Yoke hot side
Blue: plate
red B+
yoke return depends on which end the low z winding is on. usually returns to B+ red.
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Radio Candelstein - Flagship Station of the NRK Radio Network.
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KA2DZT
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« Reply #10 on: November 30, 2014, 10:50:12 PM » |
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I am cleaning up the junk boxes and have come across several items that look like smaller 2" X 2.5" tube era power supply chokes. But they have 3 wires, all coming out of one side. Leads on one are yellow, red and blue.
Any ideas what they are?
Carl
/KPD
Carl, if you see any part numbers on the xfmr I should be able to cross reference the xfmr to a Stancor or Thordarson xfmr. From there I can determine the ratios and impedances. Fred |
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Carl WA1KPD
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« Reply #11 on: December 01, 2014, 09:53:59 AM » |
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Fred
Thank you- I will pull them. As I recall there was nothing on them
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Carl
"Okay, gang are you ready to play radio? Are you ready to shuffle off the mortal coil of mediocrity? I am if you are." Shepherd
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