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 Post subject: Popular Electronics 1955 "One Tube Wallop"
PostPosted: Sep Wed 11, 2019 5:47 am 
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Location: Revere,Massachusetts U.S.A.
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Hi Folks, I've built this radio twice and I'm still not happy with it, I'm sure of the construction. I make mistakes but even I'm not that dumb. I have poor volume at best and the 1955 project article says it should power easily a 3-ohn speaker, also with a 10-foot antenna which again should be ok for a few stations I receive WBZ Boston which so powerful that a piece of wire can hear, I struggle to hear 3 stations.

Any help would be appreciated I've include two copies of the original article.
Tony


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 Post subject: Re: Popular Electronics 1955 "One Tube Wallop"
PostPosted: Sep Wed 11, 2019 6:16 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 13010
Location: Omak,wa,usa
Hello Tony,
anyway looks like it should be a nice build how is your ground or did you ground it to earth ground .

Sincerely Rich


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 Post subject: Re: Popular Electronics 1955 "One Tube Wallop"
PostPosted: Sep Wed 11, 2019 7:32 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: SoCal, 91387
Popular Electronic construction articles weren't always the best. I built a tube set in 1959 from one of their projects and never could get the damn thing to work. I even had my electric shop teacher review it, and he couldn't figure it out either.

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 Post subject: Re: Popular Electronics 1955 "One Tube Wallop"
PostPosted: Sep Wed 11, 2019 11:38 am 
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Joined: Jan Mon 17, 2011 2:10 am
Posts: 166
Location: Revere,Massachusetts U.S.A.
Hi Rich, I use a cold water pipe for a ground that's the only way I get any signal at all however, I didn't mention that per the instructions to align ask for an RF Generator to be placed at the antenna & Ground connection. Set the radio to 1600
khz and drive a signal through, I couldn't do that.

I double-checked the generator and it's working fine, I also went over the schematic just to see if a wire was placed wrong and I couldn't find it? Well I hope this helps and again Thanks So Much

Tony


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 Post subject: Re: Popular Electronics 1955 "One Tube Wallop"
PostPosted: Sep Wed 11, 2019 12:46 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 8005
Location: 13 Critchley Avenue, PO Box 36, Monteith Ont, P0K 1P0
To my eye it looks like a pretty poor radio. There's a tuned RF tank, but no RF amp because the tank feeds directly to a diode section of the tube. That's followed by two stages of audio. In my opinion you'd be better off to use a dual function tube (triode pentode or even double triode) for audio and do your detecting with a crystal. The way this set is built, unless your tank circuit is well built(hi Q), it's not going to "select" well.

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 Post subject: Re: Popular Electronics 1955 "One Tube Wallop"
PostPosted: Sep Thu 12, 2019 12:45 am 
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Joined: Dec Sun 14, 2008 3:33 pm
Posts: 862
Location: Tokyo
One suggestion that might help a little. The antenna input VC is just 3~30pF. That's OK for SW but too small for MW BC. Especially with a short antenna. Try putting a larger cap across that (100pF~470pF). That should increase the signal level. It might even work to simply connect your antenna directly to the tank; after all, it's basically just a crystal diode with audio amplification.

Rob


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 Post subject: Re: Popular Electronics 1955 "One Tube Wallop"
PostPosted: Sep Thu 12, 2019 1:53 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 9083
Location: Beaver Falls, PA. USA
It's basically a tube version of a crystal set, with a two-stage audio amplifier. It will have all of the reception problems of any crystal set; you'll need a good antenna and ground. Are you using a standard antenna coil?

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 Post subject: Re: Popular Electronics 1955 "One Tube Wallop"
PostPosted: Sep Thu 12, 2019 3:47 am 
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Joined: Sep Sat 27, 2014 4:24 am
Posts: 1825
Location: Oxford, MI
If you are interested in a one tube radio with the same tube perhaps consider one of these?

The first is a regen with a single audio stage and the other is a TRF with a single RF stage, detector and audio amplifier.

http://makearadio.com/tube/1d8-sw.php

http://onetuberadio.com/2015/02/25/one- ... iver-1945/

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 Post subject: Re: Popular Electronics 1955 "One Tube Wallop"
PostPosted: Sep Tue 17, 2019 3:03 pm 
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Joined: Apr Sat 11, 2015 5:30 pm
Posts: 781
Location: West Point, PA
Tim Tress wrote:
It's basically a tube version of a crystal set, with a two-stage audio amplifier. It will have all of the reception problems of any crystal set; you'll need a good antenna and ground. Are you using a standard antenna coil?


I agree. When I saw the Miller 6300 coil it reminded me of the Alfred P. Morgan crystal set I built. Reception was lousy, even with an amplified speaker. This One Tube Wallop is basically the same setup as the crystal set and amp.


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