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Testing rectifier tubes
08-22-2008, 12:56 PM
Gents, can a rectifier tube, such as a 35Z5 be checked properly using a DVOM?
-Brian If you collect or are interested in antique telephones, please visit Classic Rotary Phones http://www.classicrotaryphones.com/forum/index.php
08-22-2008, 08:28 PM
Brian - You can check for continuity in the heater circuit. Because of the tap on a 35Z5 for a pilot light this means there should be a small resistance between pins 2 & 7, also between pins 2 & 3, and between pins 3 & 7. The most important measurement is between pins 2 & 7 - if that is open, the tube is shot.
The meter should indicate an open circuit from pin 8 to all other pins, and from pin 5 to all other pins. If the heater circuit is continuous, there is a good chance that the tube will work, at least a little.
08-23-2008, 12:34 AM
Thanks Robert. Must be good. Pins 2 & 7 have about 30/35 ohms. Same with pins 3 & 7.
Brian -Brian If you collect or are interested in antique telephones, please visit Classic Rotary Phones http://www.classicrotaryphones.com/forum/index.php 
08-23-2008, 10:56 PM
one thing about questionable rectifier tubes, if there is a internal- short in the plates, they can produce a nice mini-light-show for free!
08-27-2008, 02:39 PM
Texasrocker Wrote:one thing about questionable rectifier tubes, if there is a internal- short in the plates, they can produce a nice mini-light-show for free! Yes, I recall such a lightshow inside a 6X5 some years back. Best regards. Mike "Did you say 'utes'?"
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