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Loctal Tube Sockets in the Philco 40-120 Radio
MrFixr55
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#2

07-18-2024, 09:59 PM
Hi T32,

There are no dumb questions, congratulations for pursuing this hobby!

The purpose of the center "Loktal" pin contact is to ground the metal shell of the Loctal tube. This is not important on the rectifier and audio output tube, but could be very important on the RF, Convertor, IF and 1st Audio tubes, especially those that have shields that fit over the tube but do not contact the chassis. These shields ground to the metal base which is grounded by that center pin.

Hope that helps.
"Do Justly, love Mercy and walk humbly with your God"- Micah 6:8
Best Regards, 

MrFixr55
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RE: Loctal Tube Sockets in the Philco 40-120 Radio - by MrFixr55 - 07-18-2024, 09:59 PM



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  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration