Vacuum Tube cross reference and Hickok 539B/C set up data. Thank you for your interest in our 539B and 539C Hickok set up data and tube cross reference. The data is provided in 'electronic' form because we found it easier to search for tube types and pin outs using a PDF reader.
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The Blue Box GR1408 08DTC Lighting Control & Design Smart Relay Panel This SMART RELAY PANEL was installed, but it was never to put into service, due to the fact that it was a construction project that was never completed because of funding. As seen in the pictures, it is in outstanding cosmetic c
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