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 Post subject: Anyone add an indicator/magic eye tube to a regen set?
PostPosted: Sep Sun 26, 2021 3:13 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Boston, Massachusetts
I see they have a couple low voltage ones

Toyo Musen 1D-E14 Tuning Eye Tube
Amperex 6977 DM160

If so how do you connect it? Schematic

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 Post subject: Re: Anyone add an indicator/magic eye tube to a regen set?
PostPosted: Sep Sun 26, 2021 3:46 am 
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Location: Montreal, Quebec
S-meters and magic eye tubes are connected to the agc line, the voltage varying with the signal strength.

But no agc in a regen receiver, so nothing to measure.

I asked the same question fifty years sgo.


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 Post subject: Re: Anyone add an indicator/magic eye tube to a regen set?
PostPosted: Sep Sun 26, 2021 3:49 am 
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The triode of the eye tube FWIR has been used as a detector, but it did not deflect the cathode rays, just lit up green...

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 Post subject: Re: Anyone add an indicator/magic eye tube to a regen set?
PostPosted: Sep Sun 26, 2021 4:05 am 
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Location: Lexington, KY USA
I think most regen circuits have grid leak bias that will vary with the signal strength.

The grid voltage change is probably too small to drive an eye tube directly, but an amplifier might be used to make it work.

Ted


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 Post subject: Re: Anyone add an indicator/magic eye tube to a regen set?
PostPosted: Sep Sun 26, 2021 5:13 am 
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Chas wrote:
The triode of the eye tube FWIR has been used as a detector, but it did not deflect the cathode rays, just lit up green...


I saw that

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 Post subject: Re: Anyone add an indicator/magic eye tube to a regen set?
PostPosted: Sep Sun 26, 2021 12:26 pm 
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https://worldradiohistory.com/hd2/IDX-S ... e-0020.pdf

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 Post subject: Re: Anyone add an indicator/magic eye tube to a regen set?
PostPosted: Sep Sun 26, 2021 4:46 pm 
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Location: Lexington, KY USA
Might work better with a 2E5?

I wonder how much eye deflection you would get, even with a proper A supply.

Ted


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 Post subject: Re: Anyone add an indicator/magic eye tube to a regen set?
PostPosted: Sep Sun 26, 2021 5:29 pm 
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azenithnut wrote:
https://worldradiohistory.com/hd2/IDX-Site-Early-Radio/Archive-Radio-Craft-IDX/IDX/30s/37/Radio-Craft-1937-05-OCR-Page-0020.pdf

-Steve


Dave Schmarder has the complete article on his website.

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 Post subject: Re: Anyone add an indicator/magic eye tube to a regen set?
PostPosted: Sep Tue 28, 2021 2:02 pm 
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I looked through Dave's website. If the article is there it is well hidden.

I did find this thread here on ARF.

viewtopic.php?f=12&t=239000

-Steve

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 Post subject: Re: Anyone add an indicator/magic eye tube to a regen set?
PostPosted: Sep Tue 28, 2021 3:01 pm 
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azenithnut wrote:
I looked through Dave's website. If the article is there it is well hidden.

I did find this thread here on ARF.

https://www.antiqueradios.com/forums/vi ... 2&t=239000

-Steve


Here it is: http://peeblesoriginals.com/radioarticles/

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 Post subject: Re: Anyone add an indicator/magic eye tube to a regen set?
PostPosted: Sep Wed 29, 2021 4:20 pm 
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Location: Long Island NY
Back in the 1970s, Radio Shack had a regenerative short wave radio kit that featured a tuning meter. Transistor, of course, but it shows that it is possible to meter a regen. Wherever a meter can be used, an eye tube could be adapted to work through an appropriate "sense" resistor in series with the current being measured. The tuning meter on the Radio Shack kit not only responded to signal strength but it also let you see when you had advanced the gain too far and the set was going into oscillation.

In a classic tube regen, you could set up an eye tube to monitor the cathode current across a low value, well bypassed resistor. One would have to know the circuit you are working with to figure out the best arrangement. Measuring plate current would work too but it might be harder to do with an eye tube since the grid circuit would have to be at B+ voltage.

One other thing to consider. Most tube regens like to run around 45 to 67 volts on the plates. Eye tubes will not even light up at that voltage. Unless you have a brand new tube it will be dim at 120 VDC. Put 200-250 VDC on them and then you're talking brightness. So you may have to think about power supply considerations too; an eye tube will probably need more voltage than you are using on the regen itself. A tuning meter might actually be a more practical thing to implement.

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 Post subject: Re: Anyone add an indicator/magic eye tube to a regen set?
PostPosted: Sep Wed 29, 2021 4:49 pm 
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The DM-70 "Exclamation Point" indicator tube is designed for battery operated set use and has an anode voltage of 85 volts.

It is a filamentary tube with a 1.4 volt filament.

-Steve

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