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Those are sure interesting and different sets. I think they also had one model that you could actually remove the portable TV from the console if you wanted to take it to another room.
If you connect your meter to the filament pins and set it on the audible continuity range and tap the neck and you hear short beeps you may be able to weld the filament back together. I have done it with success using a 40vdc supply that is current limited to 1 amp. Tap the neck and when the filament welds, the current sense circuit kicks in and reduces the voltage and limits the current. I have done it twice and the fix has held. Not sure if it matters but I also wired in a 47mfd electrolytic in parallel to the supply to add a little extra kick. You've got nothing to loose.
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Tim
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