|
DC resto and linearity
some years ago, I posted a resto of an RCA 6T75 chassis with bad horizontal linearity much as youve shown. Now im excited to dig back in and see if I can improve it with the drive trimmer! thanks for the motivation. incidentally that set has shadowing similar to yours, and ive never solved it.
im on my phone and couldnt get a great look at the video section of your schematic...but rhe set does appear to lack DC restoration as has been said.
skmewhere I have a 1950 breitman service book with dozens of late 40s schematics...Ill also look for a similar cathode drive circuit with a dc restoration circuit.
can you pass along your full schematic? or at least pass me the chassis number? Im a little late to the party...
thr RCA has a phono input with a switch that blanks the video...i repurposed thr switch to also cut over to an composite video input, which in thr RCA is relatively painless to add.
BTW, i find a strange array of sets Have/dont have dc restoration. by 1950 even Muntz sets sported DC restoration at thr lowest possible price point. honestly, i suspect that with low contrast "live" images of the late 40s, youd never notice the difference. With high contrast content now, the difference is fairly bothersome.
|