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RCA VICTOR MODEL 14" PORTABLE |
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THIS IS A 14 INCH BLACK AND WHITE METAL CABINET PORTABLE. IT WAS MADE IN THE LATE 50'S AND HAS UHF TUNING, AN OPTIONAL ACCESSORY AT THAT TIME.
THIS IS A "HOT CHASSIS" SET. READ ON AND SEE WHAT I HAD TO DO TO MAKE IT SAFE TO OPERATE ON NORMAL HOUSEHOLD CURRENT. |
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HERE IS THE SET AS FOUND. TWO OF THE MOUNTING FEET ARE GONE, CAUSING IT TO SIT LOPSIDED. |
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THIS VIEW IS FROM THE FRONT OF THE CHASSIS, WITH THE CRT REMOVED. ALL PAPER AND ELECTROLYTIC CAPS WERE REPLACED AFTER THE FIRST SOFT START.
CIRCLED ARE THE DREADED SELENIUM DIODES. THESE WORKED, BUT THEY WERE REPLACED WITH SILICON DIODES. |
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THIS VIEW SHOWS THE PRINTED CIRCUIT BOARD. NOT PICTURED IS A METAL SHIELD, WHICH COMPLETELY COVERS THE BOTTOM OF THE BOARD. I HAD TO REMOVE THE VHF TUNER JUST TO GET TO SOME OF THE SOLDER POINTS ON THE SHIELD. RECAPPING WENT SMOOTHLY. FORTUNATELY, THIS BOARD IS IN GOOD SHAPE, WITHOUT WARPING , CRACKING, OR BAD SOLDER JOINTS. |
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HAVING A CORRECT SCHEMETIC IS A MUST. I HAD TO TRACE OUT THE POWER SUPPLY. I HAD A PRINT FOR A SIMILAR SET, BUT THAT SET USED A POWER TRANSFORMER. AFTER RECAPPING AND PUTTING THE SET BACK TOGETHER, I DID A SECOND SLOW START. ALL WENT WELL. WHEN I PUT THE TOP CAP ON THE HORIZ OUT TUBE, I HAD NO PICTURE. I ALSO HAD NO VOLTAGE ON THE TOP CAP (OFF THE TUBE). TO AVOID BORING YOU WITH ALL THE DETAILS, I'LL CUT TO THE CHASE. WHEN I REBUILT THE POWER SUPPLY, I MISWIRED IT. I HAD PUT THE WIRE COMING OFF THE FIRST FILTER ON THE WRONG SIDE OF A 22k RESISTOR. THAT KILLED THE MAIN B+ (SECONDARY VOLTAGES WERE OK. AFTER KICKING MYSELF, I REWIRED IT CORRECTLY AND WAS REWARDED WITH A NICE, BRIGHT PICTURE.
THERE IS AN ISSUE WITH THE VERTICAL. THE VERTICAL LINEARITY SHRINKS AFTER THE SET HAS BEEN ON A WHILE. I THINK I MAY HAVE SOME RESISTORS DRIFTING UP IN VALUE AS THE SET PLAYS. I ALSO FOUND OUT THAT THE 6AQ5 (USED AS A VERTICAL OUTPUT TUBE HERE) IS INFERIOR TO OTHER TUBES USED FOR THAT PURPOSE.
THIS IS A "HOT CHASSIS" SET. WHEN I REASSEMBLED THE SET IN THE METAL CABINET, I CHECKED TO BE SURE THERE WAS NO SHOCK HAZARD. THERE WAS. SOMEWHERE, THE CHASSIS WAS CONTACTING THE CABINET. FORTUNATELY, THE SWITCH IS CONNECTED DIRECTLY TO THE POWER SUPPLY INSTEAD OF THE CHASSIS. ALL I HAD TO DO WAS POLARIZE THE PLUG, AND THE CHASSIS IS SAFE WHETHER THE SET IS ON OR NOT, PROVIDED THE OUTLET IS WIRED CORRECTLY.
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NEXT PAGE THE COLLECTION RCA INDEX |
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