tube checker

servicing a Sylvania 620 Tube Tester

I recently refurbished a Sylvania model 620 tube tester. The manual was dated 1955, so that is the approx vintage. Sylvania describes the test method as “Sylvania Composite Transconductance and Emission.” (Source: Sylvania 620 service manual, page 5). This method is not the same as Hickok’s Mutual Conductance. This is an extremely well-built tester. Construction […]

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Sencore Mighty Mite TC28, TC162, TC154

Tube Testers / Bob

Sencore Mighty Mite solid-state tube testers (TC28 Hybrider, TC162, and TC154) are durable, easy-to-use, and test a wide variety of modern tubes (including modern sweep tubes such as #8950). They were VERY popular among old-timer technicians. For most people, they are a very good choice. Regardless of model, all the Mighty Mite solid-state models use

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