03-09-2026, 07:28 PM
Welcome to the Phorum!
I saw you posted 3 similar questions so I only approved this one for the thread to continue. If the others had additional info that I missed then just add to this thread with additional questions just as others will try to help you with answers. I also moved the thread to the Electronic Restoration section.
The schematic for the 89 that we have in the library is seen at the following link:
https://philcoradio.com/library/download...l.%201.pdf
The lamp (item 10 on the schematic) looks like it runs directly off the heater/filament transformer. It could be wired in at any one of many places. 6608 lamps are 6v lamps now known as #46 lamps. See: https://philcoradio.com/library/index.php/parts/lamps/
You mention in one of the posts something about counting pins. Not sure how familiar you are with all this. Tube pins are counted from the "key" (usually a blank space other notation) counter clockwise looking at the bottom of the tube base from under the chassis. So the first pin counter clockwise from the key is 1, then 2 and so on.
Another, perhaps clearer diagram of the 44 tube is here:
I'm sure others with better trouble shooting skills than I have will chime in on this and help you out.
I saw you posted 3 similar questions so I only approved this one for the thread to continue. If the others had additional info that I missed then just add to this thread with additional questions just as others will try to help you with answers. I also moved the thread to the Electronic Restoration section.
The schematic for the 89 that we have in the library is seen at the following link:
https://philcoradio.com/library/download...l.%201.pdf
The lamp (item 10 on the schematic) looks like it runs directly off the heater/filament transformer. It could be wired in at any one of many places. 6608 lamps are 6v lamps now known as #46 lamps. See: https://philcoradio.com/library/index.php/parts/lamps/
You mention in one of the posts something about counting pins. Not sure how familiar you are with all this. Tube pins are counted from the "key" (usually a blank space other notation) counter clockwise looking at the bottom of the tube base from under the chassis. So the first pin counter clockwise from the key is 1, then 2 and so on.
Another, perhaps clearer diagram of the 44 tube is here:
I'm sure others with better trouble shooting skills than I have will chime in on this and help you out.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
