T1154 PA valves - UK Vintage Radio Repair and Restoration Discussion Forum

Phil G4SPZ · 7th Jan 2008, 9:37 pm

A friend of mine has found six VT104s among a box of valves in his loft. These output valves were used in pairs in the PA stage of the famous T1154 RAF transmitter.

Would anyone relatively local in the Worcestershire/Birmingham/West Midlands area owning a valve tester capable of testing these beasts properly be able to test them for us please? My simple Weston TV-4A valve checker is a bit too basic for such potentially valuable/rare valves. All expenses reimbursed of course.

Thanks,

Phil

Sean Williams · 7th Jan 2008, 9:42 pm

Phil,

I think you will struggle getting them tested on a valve tester, as there arent many that work at a kv on the anode.....

Rare? not really, Valuable? erm, about 20 quid a piece.

I have not found a bad one yet (about 20 currently in stock here)

Best you could do is lash up a test rig and compare results to the valve data.

Cheers
Sean

jim_beacon · 7th Jan 2008, 11:00 pm

Then can be teted on an AVO VCM - I've done them in the past, and they are listed in the AVO valve manual (under their civilian designation).

Jim.

Sean Williams · 7th Jan 2008, 11:15 pm

That would be PT15 then

jim_beacon · 7th Jan 2008, 11:26 pm

Thanks Sean,
I couldn't remember the number. I tested mine with a AVO mk3, so any of that range should do, not sure about the CT160 though. I fairly sure that the 2 panel type tester won't handle them.

Jim.

Phil G4SPZ · 8th Jan 2008, 12:29 am

Quote:

Originally Posted by Sean Williams

Rare? not really, Valuable? erm, about 20 quid apiece... I have not found a bad one yet (about 20 currently in stock here)...

Sean

Thanks, Sean. These valves came out of a box from an unknown source, and over half of the 'ordinary' valves in the box I tested were duff, o/c heaters and the like. Why do people put duff valves back in their boxes

... anyway, it's useful to know they're reliable, not so rare and also the civilian designation PT15. Much appreciated, guys, thanks for the info

Phil

7th Jan 2008, 9:37 pm	#1
Phil G4SPZ Dekatron Join Date: Apr 2005 Location: Bewdley, Worcestershire, UK. Posts: 4,748	T1154 PA valves A friend of mine has found six VT104s among a box of valves in his loft. These output valves were used in pairs in the PA stage of the famous T1154 RAF transmitter. Would anyone relatively local in the Worcestershire/Birmingham/West Midlands area owning a valve tester capable of testing these beasts properly be able to test them for us please? My simple Weston TV-4A valve checker is a bit too basic for such potentially valuable/rare valves. All expenses reimbursed of course. Thanks, Phil __________________ Phil Optimist [n]: One who is not in possession of the full facts

7th Jan 2008, 9:42 pm	#2
Sean Williams Dekatron Join Date: Feb 2005 Location: St.Ippolyts, Hitchin, Hertfordshire QRA IO91UW Posts: 3,518	Re: T1154 PA valves Phil, I think you will struggle getting them tested on a valve tester, as there arent many that work at a kv on the anode..... Rare? not really, Valuable? erm, about 20 quid a piece. I have not found a bad one yet (about 20 currently in stock here) Best you could do is lash up a test rig and compare results to the valve data. Cheers Sean __________________ Engineers make things work and have spare bits when finished

7th Jan 2008, 11:00 pm	#3
jim_beacon Retired Dormant Member Join Date: Mar 2003 Location: Bishop's Waltham, Hants, UK. Posts: 939	Re: T1154 PA valves Then can be teted on an AVO VCM - I've done them in the past, and they are listed in the AVO valve manual (under their civilian designation). Jim.

7th Jan 2008, 11:15 pm	#4
Sean Williams Dekatron Join Date: Feb 2005 Location: St.Ippolyts, Hitchin, Hertfordshire QRA IO91UW Posts: 3,518	Re: T1154 PA valves That would be PT15 then __________________ Engineers make things work and have spare bits when finished

7th Jan 2008, 11:26 pm	#5
jim_beacon Retired Dormant Member Join Date: Mar 2003 Location: Bishop's Waltham, Hants, UK. Posts: 939	Re: T1154 PA valves Thanks Sean, I couldn't remember the number. I tested mine with a AVO mk3, so any of that range should do, not sure about the CT160 though. I fairly sure that the 2 panel type tester won't handle them. Jim.