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OT:Tube Regenerative Receiver 12SN7/12V6

Curt All Messages By This Member #587 Awhile ago, when the regenrx yahoo group was active, I built several different iterations of regenerative receiver on the same small chassis.? It started as a twinplex, then changed to a 6SJ7 detector / 6SN7 dual audio amp, then the version it is now.? The problem is I can't remember or find the article it came from.? It uses a both sections of a 12SN7 as a regen detector/Audio preamp and the 12V6 as an audio amplifier.?? It has an audio output transformer but no interstage choke.? The original used 6 volt filaments but I used 12 so could power from the shack 13.8 PS. Anyway, after pulling the radio off of the shelf, was listening for awhile.? It tunes about 7-10 Mhz and receives AM, Sideband, and CW pretty well.? Appreciate if someone can remind me of where got the article to build this one.? Or, point me to a group with folks building tube regenerative receivers. Curt KB5JO
Nick Kennedy All Messages By This Member #588 It sounds similar?to a regen by Newkirk in the September 1992 QST, also reprinted in the book QRP power. It does use two dual section tubes. I built it and it's a good performer.? 73- Nick, WA5BDU toggle quoted message Show quoted text On Wed, Dec 25, 2019 at 4:57 PM Curt via Groups.Io <rhulett1=[email protected]> wrote: Awhile ago, when the regenrx yahoo group was active, I built several different iterations of regenerative receiver on the same small chassis.? It started as a twinplex, then changed to a 6SJ7 detector / 6SN7 dual audio amp, then the version it is now.? The problem is I can't remember or find the article it came from.? It uses a both sections of a 12SN7 as a regen detector/Audio preamp and the 12V6 as an audio amplifier.?? It has an audio output transformer but no interstage choke.? The original used 6 volt filaments but I used 12 so could power from the shack 13.8 PS. Anyway, after pulling the radio off of the shelf, was listening for awhile.? It tunes about 7-10 Mhz and receives AM, Sideband, and CW pretty well.? Appreciate if someone can remind me of where got the article to build this one.? Or, point me to a group with folks building tube regenerative receivers. Curt KB5JO
sigcom1 All Messages By This Member #589 Curt, is it this one from Oct. '59 Popular Electronics? 73.......Steve Smith WB6TNL? ? ? ? ? ? ? ? ?"Snort Rosin"
Curt All Messages By This Member #590 No it isn't that one though the 12V6 is wired in similar fashion.? There are only two tubes.? 1/2 of the 12SN7 is a preamp for the 12V6, the other half is a regenerative detector, believe in a Hartley configuration. There is a 2.5 mH pi wound choke between the oscillator plate to the grid of the other half of the 12SN7.? I will draw the schematic this weekend and send that.? I think the design came from an op's web page. The radio works pretty well, tuning and regeneration aren't touchy.? For sure I didn't arrive at this lashup cuz am not that smart. Curt KB5JO
sigcom1 All Messages By This Member #591 OK.? I have a bunch of regen stuff archived and this was the only one that cam close to fitting your description. But it turns out that schematic doesn't match the actual article from P.E. Oct. '59 which is closer but still not a match. <? Coincidentally, my grandson and I are assembling a regen during his "winter break" from school (remember when it was called Christmas vacation?).? ?It's not toobs but a QRP Guys K8TND regenerative receiver kit.? Thus far we've sorted all of the parts and compared them to the BOM while I explained in the simplest terms their function.? He surprised me when he told me that "10K" meant 10,000, HA!? This will be his first time soldering, although I've had him de-solder some stuff just to get the idea of handling a hot iron and how solder melts.? Wish us luck! 73.......Steve Smith WB6TNL ? ? ? ? ? ? ? ?"Snort Rosin"
Curt All Messages By This Member #593 Amazing! Only thing my 19 yr old grandson is interested in is girls and video games.? I have a Le Sauteur de Bayou, receiver eventually used in the Bayou Jumper transceiver that am going to expand range on.? The circuit is a duplicate of the one you are building ( or probably the other way around ).? It is a great regenerative receiver, well behaved. GL Curt KB5JO
sigcom1 All Messages By This Member #594 It was a good day for me and Alex (9 y/o).? He's completed about half (or more) of the kit assembly.? He used a Hakko 936 clone station I had kicking around in the junque and a roll of 60/40 solder that had traipsed around with me in my service truck for about 20 years before I retired.? Good mojo there.? I must say, he took to soldering like a duck to water.? After showing him the basics, he jumped right in; bending leads, placing parts, soldering and trimming leads where necessary.? I think I had to 'coach' him for about 5% of the soldering, otherwise he did it all on his own while I just sat back and snorted rosin fumes, HA!? He's made about 70 solder connections so far with -no- cold joints, no bridges and no solder splashes!? I was 'picking' parts and handing them to him but towards the end of the session he was telling me what value part to hand him.? We did do some basic tests to make sure the power supply section was functioning properly which consisted of checking to see if the power LED illuminated and he also measured voltages at 3 points in the circuit (9 V, 8.3 V and 7.5 V regulated).? He was totally jazzed, to say the least.? Other than learning how to solder, he learned how identify a diode, resistor and capacitor a now to read parts values.? He also learned how a diode functions (and was quite impressed).? He says, "I know none of my friends have done this!" So, we'll continue on Monday and hopefully get to try a 'smoke test', of the audio section at the least. 73.......Steve Smith WB6TNL ? ? ? ? ? ? ? ? "Snort Rosin"

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