Thanks for the help, Bruce. I can now see why it was the go to tester for checking the RF Voltage output of the 52-Set Sender in Medium and High Power Modes.
Interesting that it is another Stark product. Easy to find documentation for any number of their tube testers, but for their other products, not so much for some reason. And yet they sold a lot of equipment of all types over the years.
Best regards,
David
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