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 Post subject: Popular Electronics 1955. Build a 1 Tube Radio 1D8-GT
PostPosted: Jan Sat 27, 2018 10:59 am 
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Location: Revere,Massachusetts U.S.A.
Hi Folks, I’m building a one tube radio using the 1D8-GT. I’m excited about building this because of the Diode-RF-Power Output !
Have read up on this and wasn’t aware of the popularity of this tube. If anyone is interested the article Pop Tronics November 1955.

Thanks Tony


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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Sat 27, 2018 1:44 pm 
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Location: Hudson, MA
Are you sure it was Nov 1955, the only one tube receiver I found is on page 43 and uses a 6AU6

http://www.americanradiohistory.com/Arc ... 955-11.pdf

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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Sat 27, 2018 2:16 pm 
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It's in the October 1955 magazine page 51

http://www.americanradiohistory.com/Arc ... 955-10.pdf

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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Sun 28, 2018 12:52 am 
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Location: Texas. USA
Here's a July 1940 article in Radio Craft magazine for another radio (page 42) using the same 1D8GT tube. http://americanradiohistory.com/Archive ... 940-07.pdf

I used a pair in my "Batman" battery powered cigar box guitar amp. This is the faux sales flyer for it.

Attachment:
Batman - Angle - Annotated - sm.jpg
Batman - Angle - Annotated - sm.jpg [ 122.15 KiB | Viewed 2550 times ]


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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Sun 28, 2018 1:00 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Gainesville, Florida
diode triode pentode three tubes in-one super one tube radio with speaker


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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Sun 28, 2018 8:51 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Cedar Rapids, Iowa, USA
About 1964, when I was 14, I discovered my Dad's stash of circa 1940 radio books. One of them had an article about building a radio with the 1D8GT, another was designed around HIVAC midget tubes as I recall. I haven't yet found a 1D8GT. I found some midgets, but not the sockets for them. I finally gave up on building after realizing I don't really have the knack for it.


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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Sun 28, 2018 2:42 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4790
Location: Gainesville, Florida
dont give up. practice makes perfect as they say. gathering the parts is the big challenge. this radio is an interesting design with diode, triode and pentode in the same tube. I am no expert but should work really well together. diode detect, triode pre-amp and pentode power amp to drive a speaker. it is really a three tube radio

https://vacuumtubesinc.com/index.php/va ... 1d8gt.html


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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Sun 28, 2018 3:17 pm 
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Location: San Antonio, TX
A 3A8 tube will do as well with 1.4 volts (and take a little more B+ if needed)

Dale


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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Sun 28, 2018 4:46 pm 
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Joined: Jan Mon 17, 2011 2:10 am
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Location: Revere,Massachusetts U.S.A.
Hi Folks, I am missing one part, once I grab it I can start building, I’m looking for a ( 3-30 Mica Trimmer Cap ).
As a side note has anyone heard of a “Service Note “ for a Heathkit scope model 0-8.
Thanks Tony


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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Sun 28, 2018 8:45 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Gainesville, Florida
I believe that 3-30 pF is for trimming the antenna
the radio should work without it
you should be able to add it later easily


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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Sun 28, 2018 8:49 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Omak,wa,usa
Hello guys,
that looks like a fun project


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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Sun 28, 2018 10:34 pm 
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Joined: Jan Mon 17, 2011 2:10 am
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Location: Revere,Massachusetts U.S.A.
Thank you for the info, will start the build and add the trimmer later.


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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Sun 28, 2018 11:39 pm 
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Location: Beautiful Downtown Burbank CA
Interesting radio. The schematic.
Image


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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Mon 29, 2018 3:37 am 
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Joined: Jan Mon 17, 2011 2:10 am
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Location: Revere,Massachusetts U.S.A.
Ya looks really interesting will start to build soon !


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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Tue 30, 2018 5:32 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Cambridge MN USA
Meh, I’d be more interested if that triode did some RF amplification.

Scott


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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Tue 30, 2018 5:42 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 36965
Location: Livermore, CA
Could add a coil in the plate circuit for regeneration? When I built this radio didn't find the diode connection made any difference.

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Norm


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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Tue 30, 2018 6:39 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Beautiful Downtown Burbank CA
Norm, any chance a small AA5 antenna could replace the slug tuned coil?

I assume the little Radio Shack audio output transformer would work. (Secondary: 8 ohm
load): 1K ohm)

Tube ordered.


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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Tue 30, 2018 6:45 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Livermore, CA
Mike

Could use a coil from an AA5 but still need an antenna unless in a strong signal area.

1D8 should feed into a 12,000 ohm impedance. A Radio Shack 1K to 8 ohm will work but not the most volume. Notice they used outside leads on a push-pull transformer. This gives higher impedance.

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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Tue 30, 2018 7:01 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Beautiful Downtown Burbank CA
Then this Bogen T-725 using wh/blk will have to do.

Image


Last edited by Mike Toon on Jan Tue 30, 2018 10:02 pm, edited 1 time in total.

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 Post subject: Re: Popular Electronics 1955. Build a 1 Tube Radio 1D8-
PostPosted: Jan Tue 30, 2018 7:28 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4790
Location: Gainesville, Florida
p/p as single ended


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