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 Post subject: Kolster K 130 Neon Tuning Beacon
PostPosted: Jun Tue 18, 2019 9:32 pm 
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Joined: Jan Mon 12, 2015 1:39 am
Posts: 33
Any know where I could find a Kolster K 130 Neon Tuning Beacon light?


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 Post subject: Re: Kolster K 130 Neon Tuning Beacon
PostPosted: Jun Tue 18, 2019 11:15 pm 
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Joined: Nov Tue 14, 2017 5:09 am
Posts: 1628
Location: Austin, Texas
Is this the tube you are looking for:
Attachment:
Osram GJR312Z.jpg
Osram GJR312Z.jpg [ 52.9 KiB | Viewed 157 times ]

Radio Museum says it is an Osram GJR312Z.

I was trying to determine how it works form the schematic. I think the length of the light depends on the audio output level.
Edit: No, I see I missed a connection. The length depends on the total plate currents for the RF, converter, and IF stages.

Jay


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 Post subject: Re: Kolster K 130 Neon Tuning Beacon
PostPosted: Jun Wed 19, 2019 6:27 am 
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Joined: Jan Mon 12, 2015 1:39 am
Posts: 33
Yes the tube looks like that but it has 2 locking pins on the side of the base like a #47 dial light bulb.


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 Post subject: Re: Kolster K 130 Neon Tuning Beacon
PostPosted: Jun Thu 20, 2019 2:20 am 
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Joined: Jan Mon 16, 2012 4:15 pm
Posts: 5529
Location: Near Brandon, Iowa
Atwater Kent used a similar neon tuning indicator on some models. If you search this forum using the keywords
"atwater kent neon tuning indicator" you should turn up some entries on it. I recall seeing one several years ago where someone had managed to open up his defunct tuning tube, clean the inside (it was opaque, apparently with sputtered metal from the electrodes), refill it will neon gas, and reseal it. If you know how the thing is constructed you may be able to make a working reproduction of it.

I seem to recall that someone else either made, or thought about making, a replacement indicator using a string of LEDs controlled by a A/D converter.


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