Thread: Baird Garrick
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Old 17th Sep 2019, 12:54 am   #92
beery
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Join Date: Jun 2006
Location: Ware, Hertfordshire, UK.
Posts: 988
Default Re: Baird Garrick

Hi all,
part 2 of 2 of my update.

I installed a NOS CRT. It is an MW31-74 which has a cavity style anode connector and also requires an ion trap magnet. John (Heatercathodeshort) very kindly provided me with an ion trap magnet and a cavity to top cap anode adaptor (see second photo).

I powered up the set and after fiddling with the ion trap magnet, I got a picture of a sort...

The focus is poor due to the low EHT and the line linearity is terrible. I will have a go at trying different screen feed resitor valves for the line output valve when I get the chance; to see if that solves both problems.

Another issue is image cut off slightly on the left-hand side. This is mostly due to the ion trap magnet no quite being in the right place. The fourth picture shows the problem. The magnet ring is behind the focus coil, and it is just below the 10K resistor behind the paxolin panel. It really needs to be nearer the tube base, but if put the other side of the panel it interferes with the solder tags. I need to think about this one...

The last photo shows the CRT guarantee card. Do you think it is still valid?

Cheers
Andy
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