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Author Topic: Can anyone help me to identify this homebrew transmitter? thx!  (Read 2527 times)
KC9KEP
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Posts: 208


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« on: October 28, 2012, 05:41:04 PM »

Hello all,

I've recently purchased this homebrew transmitter.  It appears to feature a lot of "iron", but I don't know what the builders source for a schematic was (if any).

It features a single 6146 tube (inside the sub enclosure) some unidentifyable 9-pin miniature tube (it may be a 6GH8) and two 6DQ6's.

I suspect that the 9-pin is an audio mic pre-amp, the two 6DQ6's may be audio drivers and the 6146 the final output.  I see no oscillator so my guess is that he used an external VFO.

I'm thinking that this may be an AM mode transmitter.  Is this transmitter design familiar to anyone?  (Links to photographs follow)

Thanks & 73
KC9KEP

http://www.bignick.net/temp/a.JPG
http://www.bignick.net/temp/n.JPG
http://www.bignick.net/temp/m.JPG
http://www.bignick.net/temp/h.JPG
http://www.bignick.net/temp/d.JPG
http://www.bignick.net/temp/c.JPG



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G3RZP
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« Reply #1 on: October 29, 2012, 02:00:08 AM »

It would help to have a pic of what's in the screened box, but it looks like an amplifier with AM modulator, and needing an external exciter.
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AA4PB
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« Reply #2 on: October 29, 2012, 05:40:04 AM »

Given that the modulation transformer is rated for 20W, if it uses plate modulation then the maximum RF power is about 40W.

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G3RZP
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« Reply #3 on: October 29, 2012, 06:17:35 AM »

It looks like a mod transformer from a TCS, and it will take a bit of extra AF power (being somewhat conservatively rated), allowing the full power input capability of an anode and screen grid modulated 6146.
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K8AXW
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« Reply #4 on: October 29, 2012, 09:18:05 AM »

KEP:  No answer.... just a question...... WHY did you buy this thing?  Would you be interested in buying some more similar items? Cheap?   Roll Eyes
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KD0REQ
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« Reply #5 on: October 29, 2012, 10:20:49 AM »

single-bander for a carbon mike input, across the cathode of that 9-pinner.  be interesting to put a grid-dip meter on the tank and see what band it was.  I have a suspicion this was a handbook radio from the 50s.
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KC9KEP
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« Reply #6 on: October 29, 2012, 11:05:13 AM »

AXW,

I like home-brewing ham equipment, particularly vintage equipment.

I figure, if the transformers are good, it will be good for parts .. unless, of course, I can actually fire it up for the fun of it :-)

73

--KC9KEP

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