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MS-2931 Black screen

mR_CaESaR

mR_CaESaR

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Wondering if I might have a dead tube? My thoughts are it is, but I wanted to hear from you guys as well.

I recently purchased a second Blast City (sold as not working - we'll refer to this blast as horizontal). I got the 2931 repaired and upon installing, all I got was a black screen. When the OSD was pressed, there was also no image. When I turned the screen pot to 3/4 of the max I got a very feint image with raster lines visible and the image was washed out started to look grey. The neck glow is a nice bright orange.

I then completed a number of tests over the weekend - my baseline is my vertical Blast as that's working perfectly:

  1. Wired the Horizontal monitor/chassis on a working Vertical Blast - still the same black, completely dark with image only visible when you increase the screen pot from 3/4 and above
  2. Wired the Vertical monitor/chassis on the Horizontal Blast - works fine displays the image as normal
  3. Swapped the Vertical chassis onto the Horizontal monitor, tested on the Vertical Blast - same symptoms, completely dark. Didn't increase the screen pot as I didn't want to screw up the settings on this chassis as it's already configured and working
  4. Swapped the Horizontal chassis onto the Vertical monitor, tested on the Vertical Blast - chassis works, it was extra bright screen pot due to turning it up on the other Horizontal monitor to get the raster lines
Unfortunately I don't have access to a CRT tester or a tube rejuvenator - I think that's the only thing I can do as my last resort.

If there's anyone in AU (preferably in Sydney) that has a spare 2931 tube, that'd be great. Alternatively, I can try and organise Bill to pick up a tube for me in the Eastern states.

You guys think Is my Horizontal monitor dead? It's still got a nice orange neck glow. Is there anything else I should look out for? TIA
 
Thanks!

Inspected the R732 of both chassis

2931 originally paired with A68KZN696X (labeled 2930 on the sticker - originally the "Tate)) has Orange, White, Gold, Gold = 3.9 Ohms and works fine on my Tate cab

2931 paired with A68LBT696X (labeled 2931 on the sticker - originally the "Yoko") has Brown, Black, Gold, Gold = 1 Ohm and is very dim on the Yoko cab.

When the 2931 with the 3.9 Ohms was paired with the A68LBT696X (Yoko), unfortunately it was still a very dim image - you would expect it to be brighter since it's got a higher value
 
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