I live in Canada, and picked up a rare CRT on a whim. It's a European Model (220V) so I needed a step-up converter, has 3x SCART inputs, S-Vid & Composite so it was hard to resist.
I was cleaning out the back and took a pic & posted the tube model, then someone on the CRT Collective (Facebook Group) noticed it's the same tube used in a Blast City, so this may be useful to some who need a tube swap.
There's other model Grundigs that use this very tube, so I've added a link to a service manual that lists models that potentially use this tube, and maybe others that can be used in Blasts.
Aside from that, I have a question about this tube. When I first power it up, especially with a static screen (like when it's on a Channel for example) I get a lot of breathing (expanding/shrinking screen). It may go away after 5 minutes, but it's a little annoying. Oddly enough, I had a KX-27HG2 on the same bench last week and it was also breathing, so I'm second guessing that interference can cause this problem, but I've never heard of it happening.
I'm aware that this could just be an issue with contrast being set too high, I don't have a remote (yet) so I can't make the adjustment. I figured maybe the Blast City could have a similar problem and if there's a known fix. It works flawlessly, but the breathing and these types of 'Z' looking waves on the screen almost look like the raster is being pushed too hard by G2 or Bright.
I guess my question is if there's a method of using a Scope to test the dynamic focus board on these tubes. I figure this could be where the issue lies, either that or a bad cap in the G2 circuitry?
Link to Grundig Service Manual with compatible tubes:
https://drive.google.com/file/d/1PFf5JegX1FrhEv0P3Ko7vAzbEB170SZf/view?usp=sharing
I was cleaning out the back and took a pic & posted the tube model, then someone on the CRT Collective (Facebook Group) noticed it's the same tube used in a Blast City, so this may be useful to some who need a tube swap.
There's other model Grundigs that use this very tube, so I've added a link to a service manual that lists models that potentially use this tube, and maybe others that can be used in Blasts.
Aside from that, I have a question about this tube. When I first power it up, especially with a static screen (like when it's on a Channel for example) I get a lot of breathing (expanding/shrinking screen). It may go away after 5 minutes, but it's a little annoying. Oddly enough, I had a KX-27HG2 on the same bench last week and it was also breathing, so I'm second guessing that interference can cause this problem, but I've never heard of it happening.
I'm aware that this could just be an issue with contrast being set too high, I don't have a remote (yet) so I can't make the adjustment. I figured maybe the Blast City could have a similar problem and if there's a known fix. It works flawlessly, but the breathing and these types of 'Z' looking waves on the screen almost look like the raster is being pushed too hard by G2 or Bright.
I guess my question is if there's a method of using a Scope to test the dynamic focus board on these tubes. I figure this could be where the issue lies, either that or a bad cap in the G2 circuitry?
Link to Grundig Service Manual with compatible tubes:
https://drive.google.com/file/d/1PFf5JegX1FrhEv0P3Ko7vAzbEB170SZf/view?usp=sharing
... but thanks for the model number... will keep an eye on that!
