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https://www.ebay.com/itm/1930s-Jewell-Tube-Tester-1194/303760268535
This is a 1930's Jewell Model 199 In-Circuit Tube Tester. Case is worn due to age. It is housed in a suitcase style case with removable lid. It will test tubes from Battery radios or AC sets. The instructions show data for WD-11, WD-12, 199, 171, 26, 227, 145, 150, and many more tube …End date: Nov 19, 2020
http://www.jewellinstruments.com/analog-test-equipment-2/
Analog Test Equipment Triplett Brand Analog Test Equipment by Jewell Instruments Triplett is the brand name of the Test Equipment and Tools product group of Jewell Instruments.
https://stevenjohnson.com/testers-misc.htm
Jewell Pattern 135 Radio Tube Tester This is a early Jewell Tube Tester (Pattern 135). It only tested early 4 pin radio vacuum tubes. This tester was battery powered or could use a cord from the radio socket to power the tube under test.
https://www.antiqueradios.com/forums/viewtopic.php?p=2865586
The first Sylvania-built commercial tube testers that were available to the public were the 139 (table top) and 140 (portable), which were released in 1946. Prior to WW-2, Sylvania farmed out production of its drugstore and repair shop tube testers to companies like Jewell and Weston.
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