Quote:
Originally Posted by Steve McVoy
James, the only difference between the 441 and 525 line standards is the horizontal scanning frequency, and all the sets have plenty of range on the controls to adjust to either. So no modification is needed.
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Since the Andrea, and in fact most electrically deflected sets, don't use the horizontal signal for HV, this set would have been relatively easy to convert.
I have no experience converting 441/60i to 525/60i, but a little over 50 years ago I did convert a 405/72i to 525/60i and it was much harder to do than I had expected. The worst part was, at the time, I was unable to determine the exact specifications of the set. Not having an accurate frequency standard, nor a scope, I used an actual TV signal and a little red-neck engineering. I was so far off on horizontal that I had no idea how far I was off -- all that I knew was it was way too high, but I could see the wide vertical signal rolling, so I first converted the vertical to 60i and then was able to see the horizontal well enough to bring it in, but when I did, the drop in B Boost was enough that it messed up the vertical again, and so I had to redo the vertical.
When I got it on speed the V & H size and linearity controls were out-of-range. If memory serves me correctly, I had to change some capacitors by over 50% and adjust resistance.
Jas.