Can anyone identify 89D and VCR97 CRTs? - UK Vintage Radio Repair and Restoration Discussion Forum

tvden · 15th Mar 2006, 9:53 pm

Hi I was all having a tidy up and came across two small crt tubes one is a Cossor 4" marked 89D, and the other is a 6" marked E with a goverment arrow then VCB 97, I wondered if anyone on here knows what they are for many thanks Den

Sean Williams · 15th Mar 2006, 10:02 pm

Hi Den,

the VCR97 is an ex radar tube - green phosphor with electrostatic deflection - Most famous use was in the indicator type 62a as used with the Gee navigation system.

I think the cossor tube is a 3" one? again used in military equipment....

Cheers
Sean

jim_beacon · 15th Mar 2006, 10:21 pm

the 89D is an early double beam scope tube.

Jim.

Ed_Dinning · 16th Mar 2006, 8:50 pm

Hi Den, the VCR 97 was very popular with the home built TV people of the 50's, I've still got the parts from mine. It also made a good scope, much bigger than most of the commercial ones available at the time.
The Cossor tube is a true dual beam device and I believe was fitted to the 1035 scope. Quite a long persistace if I remember with a blue trace.

Ed

Sean Williams · 16th Mar 2006, 9:27 pm

Hi Den,

Strange, I was just doing that this evening.......

Ok,

4v on the heaters (pins 3+4)
2kv ish on the first and third anode
500 ish volts on the second anode.

Tie all the deflector plates to HT (for test purposes)

I do have a diagram here (Cheers Danny!) that makes more sense......

Or follow this link!

http://web.telia.com/~u43200663/inst/vcr97-0.htm

Mains EHT hmmmm scary stuff!

Cheers
Sean

Biggles · 17th Mar 2006, 1:35 pm

I've just had a look at the link and one thing to watch out for is that the adjustment pots are at quite a high (-) potential and if using presets to lash it up you need to be careful when adjusting. Probably stating the obvious again but just thought I'd mention it.

Biggles.

15th Mar 2006, 9:53 pm	#1
tvden Retired Dormant Member Join Date: Oct 2003 Location: Halesworth, Suffolk, UK. Posts: 413	Can anyone identify 89D and VCR97 CRTs? Hi I was all having a tidy up and came across two small crt tubes one is a Cossor 4" marked 89D, and the other is a 6" marked E with a goverment arrow then VCB 97, I wondered if anyone on here knows what they are for many thanks Den

15th Mar 2006, 10:02 pm	#2
Sean Williams Dekatron Join Date: Feb 2005 Location: St.Ippolyts, Hitchin, Hertfordshire QRA IO91UW Posts: 3,517	Re: Can anyone identify a couple of small Crts Hi Den, the VCR97 is an ex radar tube - green phosphor with electrostatic deflection - Most famous use was in the indicator type 62a as used with the Gee navigation system. I think the cossor tube is a 3" one? again used in military equipment.... Cheers Sean __________________ Engineers make things work and have spare bits when finished

15th Mar 2006, 10:21 pm	#3
jim_beacon Retired Dormant Member Join Date: Mar 2003 Location: Bishop's Waltham, Hants, UK. Posts: 939	Re: Can anyone identify a couple of small Crts the 89D is an early double beam scope tube. Jim.

16th Mar 2006, 8:50 pm	#4
Ed_Dinning Dekatron Join Date: Jan 2004 Location: Newcastle upon Tyne, Tyne & Wear, UK. Posts: 8,194	Re: Can anyone identify a couple of small Crts Hi Den, the VCR 97 was very popular with the home built TV people of the 50's, I've still got the parts from mine. It also made a good scope, much bigger than most of the commercial ones available at the time. The Cossor tube is a true dual beam device and I believe was fitted to the 1035 scope. Quite a long persistace if I remember with a blue trace. Ed

16th Mar 2006, 9:27 pm	#5
Sean Williams Dekatron Join Date: Feb 2005 Location: St.Ippolyts, Hitchin, Hertfordshire QRA IO91UW Posts: 3,517	Re: Can anyone identify a couple of small Crts Hi Den, Strange, I was just doing that this evening....... Ok, 4v on the heaters (pins 3+4) 2kv ish on the first and third anode 500 ish volts on the second anode. Tie all the deflector plates to HT (for test purposes) I do have a diagram here (Cheers Danny!) that makes more sense...... Or follow this link! http://web.telia.com/~u43200663/inst/vcr97-0.htm Mains EHT hmmmm scary stuff! Cheers Sean __________________ Engineers make things work and have spare bits when finished Last edited by Sean Williams; 16th Mar 2006 at 9:34 pm.

17th Mar 2006, 1:35 pm	#6
Biggles Rest in Peace Join Date: Feb 2004 Location: Hexham, Northumberland, UK. Posts: 2,234	Re: Can anyone identify a couple of small Crts I've just had a look at the link and one thing to watch out for is that the adjustment pots are at quite a high (-) potential and if using presets to lash it up you need to be careful when adjusting. Probably stating the obvious again but just thought I'd mention it. Biggles.