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THE RESTORATION |
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I DID A FULL RECAP ON THIS SET. IT PLAYS BEAUTIFULLY. THERE WERE SOME ISSUES AFTER THE RECAP. THE VERTICAL LINEARITY WAS WAY OFF. IT WAS SHRUNK ON THE TOP AND STRETCHED ON THE BOTTOM. THE VERTICAL HOLD WOULD NOT LOCK. I FOUND A CERAMIC COMPONENT CALLED A COUPLATE IN THE VERTICAL SECTION. MINE USED A SERIES OF THREE RESISTORS AND THREE CAPACITORS. I WAS FORTUNATE TO HAVE AN EQUIVULENT CIRCUIT LISTED ON THE PRINT. I MADE A NEW ONE WITH NEW PARTS. FOR THE MOST PART, IT WAS SUCCESSFUL. THE LINEARITY PROBLEM WAS SOLVED, BUT THE VERTICAL HOLD STILL WOULD NOT LOCK. I DID A SLIGHT MODIFICATION ( A RESISTOR WAS ADDED TO THE GROUND LEAD OF THE COUPLATE AND THAT SOLVED THE PROBLEM).
THE CABINET WAS CLEANED, AS WELL AS THE SAFETY GLASS. AFTER THE SMOKE TEST, I PUT THE SET BACK IN THE CABINET.
TWO OF THE KNOBS WERE LOOSE ENOUGH TO FALL OFF. ONE HAD ITS INSERT INTACT, BUT IT HAD GOTTEN FLATTENED OUT. I REBENT IT AND THAT KNOB FITS FINE. THE OTHER KNOB HAD THE INSERT MISSING, SO I MADE A NEW ONE FROM SHEET METAL.
I HAD TO REPLACE FOUR TUBES TOTAL. THESE WERE IN THE INTERMEDIATE FREQUENCY SECTION AND THREE OF THE FOUR HAD HEATER-CATHODE LEAKAGE. THE SET IS VERY WATCHABLE ON ALL THREE OF COLUMBUS'S VHF STATIONS (THIS DOES NOT HAVE UHF).
HERE ARE AFTER SHOTS... |
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AFTER RECAPPING. I ELIMINATED AN ELECTROLYTIC CAN. THIS MADE IT EASIER TO RECAP. |
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HERE IS THE SET WORKING. THE PICTURE IS BETTER THAN THIS SHOT SHOWS. I WILL REPLACE THIS SHOT WITH A BETTER ONE EVENTUALLY. |
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21 FEB 2005 UPDATE. THE VERTICAL COLLAPSED LAST NIGHT, IN FRONT OF FRIENDS, OF COURSE. I PULLED THE CHASSIS THIS EVENING. AFTER I MOVED THE VERTICAL HEIGHT CONTROL, THE VERTICAL RETURNED TO NORMAL. I LOOKED AT THE COUPLATE I MADE DURING THE RESOTRATION THAT REPLACED THE BAD ONE IN THE SET. THE PRINT CALLS FOR 2 0.005MFD CAPS. I USED 0.0056 CAPS. I FOUND OUT THESE ARE VALUE CRITICAL. I WILL GET SOME CAPS OF PROPER VALUE AND REPLACE THEM. I ALSO FOUND A FEW RESISTORS OVER I MEGOHM IN VALUE. THESE TEND TO DRIFT UP IN VALUE. I WILL REPLACE THEM FOR GOOD MEASURE. THIS SHOULD SOLVE THE JITTERS. RIGHT NOW, THE SET WORKS. THE HEIGHT AND LINEARITY ARE GOOD. THIS EVENT IS A GOOD REASON TO NEVER PLAY ANY RESTORED TUBE EQUIPMENT UNATTENDED.
2 APR 2006. I DECIDED TO FIRE IT UP. THE VERTICAL FILLS THE SCREEN, BUT THE JITTERS ARE STILL THERE. I WILL MAKE A NEW COUPLATE WITH THE CORRECT VALUE CAPS AND RETURN THE SET TO FACTORY SPECS. THE PICTURE IS SLIGHTLY KEYSTONED AT THE TOP. IT DOESN'T AFFECT VIEWING. I WILL EVENTUALLY FIND A NEW YOKE. I CAN PLAY THE SET SAFELY. IT ACTUALLY LOOKS BETTER THAN THE PIC ABOVE SHOWS. I WILL REPLACE THE WORKING PIC SOON.
14 FEB 2008: I FIRED IT UP AGAIN AND THE PICTURE FILLED THE SCREEN FOR A WHILE, THEN COLLAPSED. I THINK I MAY HAVE USED CERAMIC DISK CAPS FOR THE COUPLATE.
IF SO, I WILL CORRECT THAT. |
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