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 Open Filament on Rectifier Tube

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FrankB
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FrankB

Join date : 2010-11-22

Open Filament on Rectifier Tube Empty
PostSubject: Open Filament on Rectifier Tube   Open Filament on Rectifier Tube Icon_minitimeMay 3rd 2019, 7:20 pm

When I first started repairing radios I often got radios and TV sets with
"open" filaments.
 Especially 80's, 5Y3's, and 5U4's

Now being on an extremely limited budget (allowance) I was at a dead end on repairing these sets.
 Then I read an article in a very old radio repair book or magazine, and it stated:

If you have a rectifier with an apparently open filament, resolder the filament pins on the tube.

WARNING: DO NOT USE THIS METHOD IF THE TUBE SHOWS SHORT ON A TESTER. It will NOT remove shorts.

Apparently they were stingy with solder at the factor, poor socket contact, or a dirty / bad connection in the pin would cause the solder to melt away from the contact wire from the bulb and the base pin.

 "What the heck" I thought "Nothing to lose".
 I whipped out my "ancient, trusty 300 W pencil iron dating back to the 20's."
  After letting it warm up and re-tinning it I applied heat to the filament pins on numerous rectifier tubes I had put in my "Bad" box.
I sucked out any remaining solder. Then pushed flux (No Corrode Soldering Paste) into the hole with a toothpick and then added a bit of solder with additional flux. A bit of care needs to be taken, as excess solder on the outside of the pin will not allow the pin to be reinserted into the socket. But a small fine toothed file will fix it quickly.

  You could have knocked me over with a feather when i re-tested the tubes.  I had repaired about 50% of the "Bad" rectifier tubes.
(WOW! it actually worked!! Shocked Shocked ).

So before tossing any rectifier with a Septal (Large 4,5,6, or 7 pin base), or Octal base, re-solder the filament pins. You could save some money, as well as keeping another tube out of the landfill.
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