Discolored getter flashing (brown or black marks) does not mean that a tube was used. This fiction is believed by both uninformed buyers and seasoned tube jockeys. This myth seems credible because some new tubes have perfect shiny mirror getter flashing; therefore the assumption is that brown or black stains in the getter flashing must […]
brown-black getter flashing does not mean ‘Used’! Read More »
(©2008 Bob Putnak, all rights reserved.) This article discusses repair and calibration information for a number of vintage capacitor testers that all use the same fundamental test circuit. The article currently covers the EICO 950-series, PACO C-20, Knight KG-670, Heathkit C-2 and C-3, etc. (More models will be added on an ongoing basis as I
Capacitor Tester repair-calibration Read More »
This article discusses repair and calibration of the older tube-based Sencore Mighty Mite tube testers that use the 12AU7A tube inside, models TC130, TC136, and TC142. High voltages are present, repairs should only be attempted by a qualified technician. Copyrighted, all rights reserved. Introduction Sencore Mighty Mite testers employ a Cathode Emission test circuit, with
Repair & calibration Sencore Mighty Mite Read More »
Early this year I found this vintage Colin B. Kennedy Corp radio. Model 62LS lowboy console with model 54A shortwave unit. I recently finished rebuilding this radio. It is available for purchase (local pickup preferred, but crating and shipping can be arranged but will be quite expensive). It would make a beautiful addition to any
Kennedy model 62LS console radio Read More »
The “classic” cathode emission tube tester comes in many makes and models. Since they share the same circuit design, I have consolidated previous discussions into one article. Among the popular USA models are: Eico 625, Eico 628, Knight 600-series (83YX142, 83YX143, 600, 600A, 600B, 600C), Triplett 3413, Heathkit TC-1, TC-2, TC-3, IT-17, IT-21. Other makes/models
Classic emission tube testers Read More »
