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Author Topic: Possibly Driver transmitter?  (Read 210 times)
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AG5UM
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« on: October 17, 2025, 12:00:38 AM »

Well,
....While dreaming of Big Iron RCA, Westinghouse big tube legal limit AM transmitters....
I brought home a vey nice, fully working, Hallicrafters HT-40...screen grid modulation interesting little transmitter...
From a recent HamFest.  So,   
If....I could find the HT-41, and the correct VFO....
Anyway,
Guys would this nice little transmitter work well as a driver amp for a big tube Amp??
I like this little transmitter, any comments from those with much more experience than me?
These days ...at least it.... IS.... a TUBE transmitter, it even has 6 meter AM and CW.
Any comments Guys?
73
AG5UM
Donnie.
 

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KD1SH
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« Reply #1 on: Yesterday at 07:04:36 AM »

   Briefly, while the site is up, a few links to good info about the HT-40:
http://amfone.net/Amforum/index.php?topic=34555.0
https://www.wirelessgirl.net/Projects/AMTransmitters/HallicraftersHT40.html
   I've never owned an HT-40, but having had superb results applying the excellent DX-60 screen modulation improvements that Steve, WA1QIX, came up with, to my DX-60B, I'd be wondering if there's a way to apply those mods to the Ht-40. It's not the same circuit; the final PA tube isn't a 6146 as in the DX-60, but the modulator tube in both rigs is a 6DE7, so it might not be too rough. Of course, you could just maintain the controlled carrier, as designed, but Steve's DX-60 mod results in a rig with superb, nearly broadcast-quality audio. Check out:
http://amfone.net/Amforum/index.php?topic=26603.0
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AG5UM
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« Reply #2 on: Today at 12:06:50 AM »

Thanks  for these links, I have looked at a couple AMFone threads, very good and interesting as always.
I think its fun and interesting that this transmitter used Television horizontal amp output tube, 6DQ5, Cool.
I'm enjoying playing with a screen modulated transmitter for something different, I like this little transmitter, its working well.
The 6146 tubes are great also, as you say, My DX-100 uses them, I like those also, a real classic.
I need to get a VFO going for this one, I've just been using crystals with it so far.
Anyway, thanks for the comments,
I Hope AMfone comes back full time, I have'nt been getting on too much, sometimes it has shutdown while I was on here and left it "stuck", thats not fun,
seems to be working good now though.
Your DX-60 sounds like a great transmitter, great comments,

AG5UM


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