I SCORED THIS AT THE 2012 EARLY TELEVISION FOUNDATION CONVENTION. I SOFT STARTED THIS AND IT WAS UNEVENTFUL. THE CRT CHECKED AT 95% EMISSION ON ALL THREE GUNS. I BELIEVED THIS WOULD BE A RUN OF THE MILL RESTORATION. I WAS WRONG. AT FIRST, I THOUGHT I HAD A BAD VERTICAL OUTPUT TRANSFORMER. I FOUND A REPLACEMENT. READ ON LATER FOR THAT BORING DETAIL.
I HAD DONE A FUNCTIONAL RECAP OF THE SWEEP SECTIONS AND MADE SURE THE LYTICS WERE STILL FORMED. THINGS LOOKED GOOD ON THE RIG. WHEN I REINSTALLED IT IN ITS CABINET, I WAS IN FOR A SURPRISE. WITH THE CONVERGENCE BOARD CONNECTED, THE PICTURE ROLLED UNCONTROLLABLY. I REPLACED THE RESISTORS FEEDING THE PRIMARY OF THE VERTICAL OUTPUT TRANSFORMER. NO CHANGE. I REPLACED THE TRANSFORMER. I ALSO REPLACED THE LYTICS IN THE VERTICAL SECTION. IT STOPPED ROLLING AND FILLED OUT THE SCREEN. I STILL HAD A PROBLEM. THE VERTICAL "BOUNCED". THERE ARE INTEGRATING NETWORKS IN ZENITH'S CIRCUITRY THAT LOOK LIKE THREE LEGGED CERAMIC DISCS. THINK YOU CAN FIND FACTORY REPLACEMENTS? IF SO, THE BROOKLYN BRIDGE IS UP FOR SALE AGAIN, AT A BARGAIN. SAMS GIVES EQUIVALENT CIRCUITS.
THIS TIME, I TRIED SOMETHING DIFFERENT. I DIVIDED THE RESISTANCE, BUT PUT THE FULL CAPACITANCE BETWEEN THE RESISTORS. IT WORKED. AS I PLAYED THE SET OVER A PERIOD OF TIME, THE HEIGHT STARTED SHRINKING. THEY LYTIC I PUT IN THE CATHODE CIRCUIT OF THE VERTICAL OUTPUT CIRCUIT HAD STARTED TO DIE. I REPLACED THE LYTIC WITH FRESH STOCK AND THAT FIXED THE PROBLEM. I BELIEVE THIS WAS THE PROBLEM ALL ALONG. THE TRANSFORMER I TOOK OUT WAS SAVED. I BELIEVE IT'S GOOD.
IT TOOK A FEW ATTEMPTS AT CONVERGENCE, BUT I FINALLY GOT A WATCHABLE PICTURE. NOW, ON TO THE PICS.
THE ABOVE PIC SHOWS THE REPLACEMENT FOR THE INTEGRATERS. I DID THESE BEFORE I DISCOVERED THE POSSIBLE BAD VERTICAL TRANSFORMER. THE FINAL SHOT IS A WORKING ONE.
I HAD THOUGHT REFORMING LYTICS IN 60'S ERA SETS WAS A GOOD IDEA, AND TO A DEGREE HAD SOME SUCCESS. NOW THAT THESE SETS ARE 50 AND OVER, I JUST RESTUFF THE CANS AND SAY THE HELL WITH IT. I JUST HAD A POWER SUPPLY LYTIC GO OPEN.
