UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Heatercathodeshort · 1st Jan 2006, 5:19 pm

Hello,
Very interesting comments. Around 5kv should give a very good picture on a 9" aluminized tube. The post war HMV set using the U33 is the 1805 series,an example of which I have in my collection. The U33 is the post war version of the U16 used in the first generation 1936 models and the two are interchangeable. 5kv produced a super bright picture on the Emiscope TA10 10" tube and its big brother the 15" version TA15. The brillaince has to be seen to be believed! As Jon says. I also have scanned the pre war data and cannot find anything over 5kv due I think to the difficulty in winding mains transformers to that specification. A few very rare projection models used voltage doubling technique but this must have been a fire hazard to say the least! Good luck with your project. Regards. JOHN.

1st Jan 2006, 5:19 pm	#6
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: HV tube Hello, Very interesting comments. Around 5kv should give a very good picture on a 9" aluminized tube. The post war HMV set using the U33 is the 1805 series,an example of which I have in my collection. The U33 is the post war version of the U16 used in the first generation 1936 models and the two are interchangeable. 5kv produced a super bright picture on the Emiscope TA10 10" tube and its big brother the 15" version TA15. The brillaince has to be seen to be believed! As Jon says. I also have scanned the pre war data and cannot find anything over 5kv due I think to the difficulty in winding mains transformers to that specification. A few very rare projection models used voltage doubling technique but this must have been a fire hazard to say the least! Good luck with your project. Regards. JOHN.