I think it was originally 24 volt plus eht to run the tubes and yes it looks very sound for something 80 years old and it would still work today with correct plugs. It came from a radio ham and has been looked after, cheers mark.

Hello paid about 80 pounds for my example on ebay and the tube has minimal use and the high tension module that supply HT was about six pounds if you are interested in mine you are welcome to see it in operation and pay me what it owes me because I have a low attention span regards Mark frow swindon.

A broken bulb will mean that it has lost its high vacuum and no electons will flow. The tungsten filament which is operating at about 6 volts will emit electrons and these will be accelerated by about 5kv ht by the use of electrostatic focusing lenses within the tube to impact the fluresesant screen to cause the electron beam to be visable as a green dot. The electron beam that is flowing through the tube is negatively charged and is very easily bent by a magnet. I was lucky and a school was selling some old stock and the seller was unable to test the tube so I bought it at a fair price, it is most important that the filament is intact or the tube will be useless. Philip harris who still sell these tubes today ask about 500 pounds for them but if you are prepared to take a gamble on ebay can pay off- I could easily get my money back but you need to be very carefull with posting because the tube is evacuated to a high vacuum and will implode if broken so maybee the postman will crap himself or herself, a facinating item indeed.

What a brilliant idea' that's a new one for me and nice you remembered that.

Thank you for your interest and I would say that battery valves do suffer less although you cannot usually see the filament glowing due to the low voltage and yes I also have the ladybird book on how to make a transistor radio with the old germanium mullard oc71 infact this radio will easily use one in place of the valve.

I will try to catch up with you soon.

Hi Mark hope you're well. Wow that was awesome didn't expect it to be that powerful, don't think I'd want that in my pocket 😮. Best wishes stay safe Jon

Thank you Jon, I must stop buying this crap.

Looks a bit like something from Dr who.

🤣

Cheers ollie electrifying indeed, Thanks for the reply.

@@ringfinder1962 no worries. We need to go swimming together one day bro

A simple CW transmitter perhaps? You should see what frequency it’s txing at - these devices are fun but highly verboten.

Cheers Jon yes an interesting surviving example which may have powered early xray tubes, it has high voltage with some current so could be dangerous my contact email is [email protected]. Send me yours and I will send you some photos.

Sorry they are long gone

It takes a standard 1.5 volt c cell torch battery and this is stepped up by the inverter to about 5 kv.

30 or 40 pounds usually on ebay- a nice bit of nostalgia.

Its a tr200 isn't it? Nt sure weather 2 sell or use lol, jus been told tape 2 9v battery together so I did and it works

C scopes like this got many people interested in the hobby and this example still has its pipe finder licence application form so the owner did not use this one much in its life.

@@ringfinder1962 yep I used to have a license for the one I had as well,,but that was way back in the day,,if I remember right it was about £8...but as you probably know you don't need a license any more,,,in those days you needed to have a license for a radio of any kind,,but the government realised there was no way to enforce it,as there where so many around,,including pocket transistor radios lol....😄

@@ringfinder1962 yep I had a license for mine in those days you had to have a licence for a radio,even a transistor radio,,even the pocket kind..😀

I have been detecting but nothing worth a video. Thanks for the comment.