Tube Driven Air-Core Transformers

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A couple of interesting old air-cored transformers turned up. It’s quire rare to find these in high voltage power supplies even in back in the days of vacuum tubes (valves). For novelty, I decided to have a go at driving these transformers with tube drivers as they were intended and investigate the design further.
CONTENT:
00:00 - Intro
00:50 - 2nd circuit
01:58 - 1st circuit detail
02:09 - driver tube 6B/254M
03:01 - Circuit diagrams
04:12 - running and testing the larger transformer
05:45 - electrodeless tubes running with coil
07:58 - 2nd transformer running
08:18 - inside potted transformer construction.
08:24 - image of plasma globe before streamer break out.

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Опубликовано:

9 май 2024

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Комментарии : 10

@AllLoudNation365 5 месяцев назад

Cool!

@cambridgemart2075 2 месяца назад

So, the PL509, used as the line output stage in colour TVs, was a pentode, although it is often described as a beam tetrode, but rarely configured as such.

@tuopeeks 2 месяца назад

I think so, in both the PL504 (B&W) and PL509 (Colour) there are two grids but the beam plates are counted as a pentode.

@Magic_Tee 5 месяцев назад

Throughout the entire video, I had the feeling that this was a version of a vacuum-tube Tesla coil, but made in a strange manner. Transformers with an air core, in my opinion, are more optimal at higher frequencies, in the region of a few to tens of MHz - fewer turns are needed. Or in the case of very short pulses, but this is a completely different topic. A beautiful compound-filled "keg" asks to insert a core into it and discharge the capacitor to the primary winding. I think the winding insulation will hold it up.

@tuopeeks 5 месяцев назад

Interesting point to add a core given there is a hole through the transformer. It is slightly tapered for some reason and the high voltage terminal would be extremely close to a core, if fitted. Yes, it is identical to a VTTC except for the large number of turns on the secondary making the inductance 1.2H for this coil. One of my large TC coil measures around 0.15H.

@Muonium1 5 месяцев назад

This video contains a clip of a very peculiar phenomenon that I have only ever seen one other time in a short video by someone named "Frogz". At 7:50 a mercury vapor or sodium vapor lamp alumina discharge tube is illuminated, and when the arc is extinguished displays EXTREME phosphorescence. Can you please give some details on the exact model of lamp this came from and when it was manufactured? I've never seen phosphorescence like this in a consumer item outside of the ZnS and Sr aluminate phosphor powders. I'm desperate to find one and get the spectrum of the phosphorescence to see what's going on. I think it could be cerium, but the color isn't quite right.

@tuopeeks 5 месяцев назад

Yes, it's a property of a dopant used in the manufacture of high pressure sodium lamp arc tubes. These are made with sintered aluminium oxide, but many manufacturers now add a dopant to the process. I can't remember off the top of my head what the dopant is/are. What is interesting about this phosphorescence is most of the light emitted is actually in the UV and you just see the visible blue end of the light. I also have a video showing this: at 4:50, ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-vnnn3clAEG0.htmlsi=bpn0gFCKllV0vvUU

@Muonium1 5 месяцев назад

@@tuopeeks cool, I left a comment there.

@cambridgemart2075 2 месяца назад

2:58, I don't think a beam triode exists, probably a beam tetrode, just like the KT66

@tuopeeks 2 месяца назад

You're correct, don't know were I got 'triode' from must have been playing with too many valves.