12-31-2014, 03:44 AM
No rubber to worry about in the 37 models.
If you wire pins 2-7, 3-4 and 5-6 you can use either tube so check continuity between those pins or just install a 5X4. They are the same electrically. You can remove the top nuts and remove the top transformer bell cover to get to the wires.
If you wire pins 2-7, 3-4 and 5-6 you can use either tube so check continuity between those pins or just install a 5X4. They are the same electrically. You can remove the top nuts and remove the top transformer bell cover to get to the wires.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
