12LP4 base ripped off, questions about putting back together.

[dtvmcdonald]

You determine the orientation by two methods:

1) use an ohmmeter and find which two wires are the heater

2)determine what the orientation of the key is by examining the
datasheet (google "12LP4 pocnet") to see the pattern of unused pins.

These should agree.

To fix the tube, go to your Lowe's etc. and get a round diamond grit disk cutter tool
for a Dremel tool. You don't need the Dreml tool ... you work by hand.
Then slowly use the tool to grind down the glass, very carefully, around each lead broken exactly at the glass, 1/32 inch will do. It the lead sticks out even a little that's
not necessary.

Then solder on a 3 inch length of one conductor from piece of stranded hookup wire
to each nub. These can be threaded through the cleaned out base pins, along with the
unbroken wires. Then solder the wires to the pins.

Of course you have to attach the base to the tube. I've always used duct tape ...
this is politically incorrect.