The previous attempt at powering on blew the cathode fuse I had installed. This was due to what I initially believed to be a loss of drive - but it turned out the horizontal output (6DQ5) had failed, possibly as a result of the HV failure in the focus circuit. With the new tube in we finally have a raster, such as it is.
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https://www.youtube.com/watch?v=MJnsTpwzSz8
Thin or narrow belts can oscillate on their pulleys, causing increased wow and flutter. Make sure to get the right one for your application
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https://www.youtube.com/watch?v=cDoNmmSIRVA
Finally figured out why the stereo lamp wasn't lighting - The stereo multiplex was not firing. This turned out to be due to a defective switching transistor that switches from mono to stereo operation and turns on the lamp. The original was barely adequate for the job - our test one works but runs a little too hot. Once I put a beefier transistor in the set works beautifully and is now fully aligned.
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https://www.youtube.com/watch?v=AVQzdhEaX-0
The compression is better, but bad noises lurk within. No sticking valves or lack of lash. Sounds like slap or bad bearing :(
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https://www.youtube.com/watch?v=AnnxUoc4fpg
Used to see these everywhere in the thrift stores in the late 1990s. Let's open this old stock up and have a look
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https://www.youtube.com/watch?v=vPohP0y9aB8