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Old 2nd Nov 2021, 11:20 pm   #15
Niechcial,Steve
Hexode
 
Join Date: Jan 2007
Location: Beckenham, London, UK.
Posts: 373
Default Re: Bush Dual Standard Colour Restoration

Good progress on this. I now have the shunt stabiliser in circuit with good width, focus and EHT stabilisation on both systems. I've been through all the pots, Cs and high value resistors on the timebase unit replacing where necessary (I completely rebuilt the focus chain). As far as I can see there is actually no beam limiter on this Mk 3 timebase unit. Can someone tell me if I'm wrong on that? I've cleaned up the tuner which needed very little work, and restored the operation of the system switch solenoid. I need to organise the mechanical switching linkage between tuner and IF which someone has just chopped.
I attach pictures of 405 and 625 operation. As you can see, there is the same very bad Dynamic Convergence on both systems. I haven't explored yet, but it looks too bad just to be mis-adjustment- must be a fault somewhere. I also have almost non-existent Frame sync
Attached Thumbnails
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Name:	Bush on 625.jpg
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