I recently found a February 1940 Jackson tube tester modernization bulletin. This bulletin explains the modernization options available for Jackson tube tester models 627, 627-C, 630, 633, 634, 634-C, 634-D, 635, 637, 680. It also includes the wiring diagram to install a Loctal socket into models 627, 630, 633, 635, 680. Very interesting bulletin for […]
1940 Jackson modernization bulletin Read More »
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
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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 »
