Click on the picture to enlarge  

 
Builder Scuola Radio Elettra
Model Not specified
Year 1970 about
Tubes None
Power 110-160 Vca
Size 23x17x8

 

Detailed view of the inductor wich has been added to the circuitry to avoid auto-oscillations. This tube tester was build by myself about in the '70, it was sold by "Scuola Radio Elettra".

More details HERE , with the schematic diagram that explains inside a red squares the modifications required.

View of the tube tester during an heather glow check. With this instruments is possible to check some important parameters of the tubes.
The picture displays the tube tester with its mesurement indicator, a tester. In the tester scale there is a sector marked as "GOOD" "?" "NO GOOD" wich is useful to verify the tube under test. Click on the picture to enlarge


 
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