V13 is the
When making pin-to-ground resistance measurements, make SURE the radio is configured like this. To locate tubes, see this.
Resistance measurements made with Simpson 260.
"Open" or "no pin" means the tube does not use the pin but it might have been used as a junction for other components.
Pin 6 is no pin but is apparently used as a junction for who-knows-what
Radio #5 is 63,000 to ground, radio #4 is 62,000 to ground.
Pin to Radio Radio Radio chassis #5 #6 #7 1 0 0 0.2 2 0 0 0 3 6,730 open open 4 15,320 44,000 14,000 5 595,000 56,000 460,000 6 - no pin 71,500 open 64,000 7 0.1 0.2 .2 8 248 200 200 V13 pin 3 to V14 pin 3 ? ? V13 pin 5 to V14 pin 5 ? ?
Pin to From the chassis docs 1 0 2 0 3 15,000 4 15,000 5 500,000 6 no pin 7 0.1 8 250 V13 pin 3 to V14 pin 3 500 V13 pin 5 to V14 pin 5 600,000
Tube pinout images are found on tdsl.duncanamps.com
For reference:
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Last modified: Monday, 1 Jun 2026