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Author Topic: Interesting HB Transmitter  (Read 4095 times)
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Carl WA1KPD
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« on: October 27, 2012, 09:51:10 PM »
Picked up a small HB xmtr at Nearfest.  6AS7 (osc), 25A6 (PA) and 25Z6 rectifier.

Straight AC no transformers, and it is modulated! Nice National plug in coil set

Sounds like something out of an old Gernsback book or Mech Illustrated. Does it ring a bell with anyone?

I can trace it but it is always easier if there is a schematic

Thanks and 73

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
W7TFO
WTF-OVER in 7 land Dennis
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IN A TRIODE NO ONE CAN HEAR YOUR SCREEN


WWW
« Reply #1 on: October 27, 2012, 10:20:49 PM »
Looks like a real sweetie Kiss!  I love HB over factory any day.

How does that jewel modulate, BTW?

73DG
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W3GMS
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« Reply #2 on: October 28, 2012, 02:13:17 PM »
Quote from: Carl WA1KPD on October 27, 2012, 09:51:10 PM
Picked up a small HB xmtr at Nearfest.  6AS7 (osc), 25A6 (PA) and 25Z6 rectifier.

Straight AC no transformers, and it is modulated! Nice National plug in coil set

Sounds like something out of an old Gernsback book or Mech Illustrated. Does it ring a bell with anyone?

I can trace it but it is always easier if there is a schematic

Thanks and 73

Carl

/KPD

Great find Carl.  I am sure you will have fun with it.  I often wonder why the ops build such rigs on such small chassis.  Very busy under the chassis! 

Joe, W3GMS
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Simplicity is the Elegance of Design---W3GMS
KM1H
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« Reply #3 on: October 28, 2012, 04:38:25 PM »
I take it you meant a 6AG7 oscillator.
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Carl WA1KPD
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« Reply #4 on: October 28, 2012, 07:42:13 PM »
Quote from: KM1H on October 28, 2012, 04:38:25 PM
I take it you meant a 6AG7 oscillator.



No, 6SA7 is what is in there
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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
KM1H
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« Reply #5 on: November 03, 2012, 09:50:00 PM »
But you originally typed 6AS7 Grin
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Carl WA1KPD
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« Reply #6 on: November 04, 2012, 09:11:43 AM »
Quote from: KM1H on November 03, 2012, 09:50:00 PM
But you originally typed 6AS7 Grin
Yep, I made a typo at first.

Do you think the 6SA7 would be a good osc? Or maybe someone threw is in there to fill up a spot
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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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« Reply #7 on: November 04, 2012, 09:21:54 AM »
Hallicrafters did it in the SX-28/32 by configuring as a triode. Strange but it works.

Ive used regular receive 6SK7 pentodes for VFO's but the 6AG7 is the best xtal oscillator going in an octal.

Carl
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