Today was my annual warehouse spring cleaning day, so it was a good opportunity to take a “family photo” of my tube tester collection. My collection changes all the time, sometimes daily. I did include all of the models that I use everyday for tube sales and bench servicing, and also models that I “rotate […]
my tube tester collection Read More »
I am frequently asked to explain what all of the “letters and numbers” mean in a vacuum tube number. In the early days of radio, tube numbers were haphazardly assigned to new tube types. As more vacuum tube types were developed, it became more difficult for technicians to recognize any fundamental characteristics about a tube.
RMA Tube Numbering Code Read More »
How to Use a Tube Tester… and Tube Issues (in General) by Bob Putnak, ©2010. All rights reserved. Last update: Jan 2014. Your tube tester is often the first test instrument that you reach for when diagnosing problems in tube gear. All tube testers are a compromise in functionality, compromise in accuracy, and none are
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Here is a truly historical item — a LEEDS & NORTHRUP CO. Wheatstone bridge. It has Western Electric K.S.3011 designation. The craftsmanship and build quality of this device is truly remarkable. I cannot fathom how much money it would cost to build this same device today using identical components. The unit consists of a large
Leeds & Northrup bridge, and Eico 221 VTVM Read More »
This article discusses repair and calibration of the B&K 600 / 606 tube testers. Both models can share the same tube setup data book, and therefore both models are functionally equivalent. Model 606 will be example shown in this article. Electrical voltages are present, repairs should only be attempted by a qualified technician. Copyrighted
B&K 600-606 tube tester Read More »
