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[email protected] kstlfido@gmail.com is offline
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Default Restoring a TV-7/U Tube Tester

The type 83 can operate horizontally just fine, but in one plane, which the TV7 socket position does for you. Think filament sag as they heat up. In one direction, they will have more space so as not to touch the anodes.

Also, the link given for an 83 solid-state replacement will not work properly. You need to re-create the 15v drop the 83 has. Search for 83 replacements using zener diodes. These will work much more like an 83.