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Old 30th Oct 2014, 8:40 pm   #81
Anthony Thomas
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Join Date: Jan 2013
Location: Ålesund, Norway
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Default Re: VCR97 Project

Thanks for that Ed, recently unearthed my project and all relative notes. I wont bore others with details of what I have found but have many of the hard to find parts like 15 of those VR65 (SP61) valves and their Mazda Octal bases. I also have a CV2810 cathode ray tube.

I have also downloaded all updates on the excellent Argus replica and compared them with the diagrams in FJ Camms book Practical Television circuits which was apparently printed in 1954 so should contain corrected diagrams.
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Old 30th Oct 2014, 9:50 pm   #82
Ed_Dinning
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Default Re: VCR97 Project

Hi Tony, lets see what you can do by the end of a Norwegian winter!
These sets would probably work equally well with EF80 valves or similar RF pentodes; the bases would be easier to source.
For anyone else contemplating building this set I may have some suitable tubes.

Ed
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Old 30th Oct 2014, 10:15 pm   #83
M0FYA Andy
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Default Re: VCR97 Project

Mazda Octal bases aren't a problem to get, Langrex have them in stock.
Andy
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Old 30th Oct 2014, 10:22 pm   #84
Anthony Thomas
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Default Re: VCR97 Project

I bought ten new Mazda octal sockets and nine top caps from J Birkett a while back, they have or rather had a lot of the "good old stuff" that we hoarders like.

Tony
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Old 30th Oct 2014, 10:36 pm   #85
Anthony Thomas
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Default Re: VCR97 Project

Quote:
Originally Posted by Ed_Dinning View Post
These sets would probably work equally well with EF80 valves or similar RF pentodes; the bases would be easier to source.
For anyone else contemplating building this set I may have some suitable tubes.
I have also wondered if 6AC7 valves would work well as they have quite a high slope too.

The chassis for the Argus shouldn't present any undue challenges if I can gain the use of the folding break at a local body repair shop, the owner does sort of owe me a favour

I have a chassis from a Sun 99 motor tester that has a pretty interesting transformer on it that should yield both EHT and HT windings. I will use separate transformers for the heaters in the timebase etc and certainly a boost transformer type of transformer for the CRT 4 Volt. The CRT heater winding is the first winding on the transformer and often gives short to the laminations I have been told. I have the Sun 99 chassis more or less complete and the circuit diagram so a good EHT / HT chassis with good insulation etc etc will be top priority. I know that the Sun 99 did work before it was dumped.

Since the CV2810 is a rare CRT these days I have considered using a 5ADP1 to test the time bases and EHT on.

Tony
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Old 9th Feb 2015, 10:27 pm   #86
Anthony Thomas
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Default Re: VCR97 Project

Quote:
Originally Posted by Ed_Dinning View Post
These sets would probably work equally well with EF80 valves or similar RF pentodes; the bases would be easier to source.
For anyone else contemplating building this set I may have some suitable tubes.
Ed

I noticed that you suggested EF80 valves in this project, I found that 6BW7 are pin compatible to EF80 and are slightly better specification than EF80. They are closer to SP61 than EF80 is.

What do you think of using these?

Thanks in advance.

Tony
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Old 10th Feb 2015, 10:33 am   #87
Ed_Dinning
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Default Re: VCR97 Project

Hi Tony, they should work pretty well in the majority of these circuits.

Ed
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Old 4th Aug 2015, 9:43 pm   #88
blott203
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Location: Aylsham, Norfolk, UK.
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Default Re: VCR97 Project

Hi Everyone,
I have two VCR97 CRTs, one with mu-metal shield and base, stamped A.M.

Would these be of any interest to anyone?

Radio & electronics was my hobby many years ago, but having worked in the business for many years, I sort of lost interest in it as a hobby.

Would like to see them go to a good home.

I live in Aylsham, Norfolk, 12 miles north of Norwich.

Cheers, Mike
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Old 5th Aug 2015, 10:45 pm   #89
Anthony Thomas
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Default Re: VCR97 Project

I hope that someone takes you up on that offer, I am too far away to collect or arrange collection. Besides I wonder what the airline security would say if I was to take them on board as cabin baggage
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