Quote:
Originally Posted by vortalexfan
OK, so I looked over my chassis after you mentioned the missing wire and sure enough, I'm not sure how I missed it but I forgot to put that wire back in when I removed it from the old can cap to install the new one, I now have the voltages back in the audio section, and its functioning as it should. 
But now I have a new problem, one of my Video IF tubes was bad (which is why I'm not getting anything from the tuner) which is a 3CB6 and I tried subbing in a 6CB6 (because I have a whole butt load of them) and it seems the TV doesn't like them, because they just glow white and then just die after 3 seconds (and it doesn't matter which 3CB6 socket its stuck in, it does the same thing in all 3 sockets) and I was hoping I could get away with not having to order a new tube for the TV (as I don't have any 3CB6 tubes in my stash.)
Is it normal for a 6.3V Tube to glow white hot and then burn out after 3 seconds in a socket originally meant for a 3V tube in a series string set?
I was thinking that it was possible to install a higher voltage tube in a lower voltage tube spot in series string radios and TVs (like how you can sub in place of a 35L6 a 50L6 on old Series string radios and it would run fine.)
Am I missing something here?  |
3CB6 is 600ma filament vs 6CB6 300ma. In other words your entire series string of tubes should be 600ma type, so trying to pull 600ma through a filament intended for 300ma isn't going to cut it. Your 6AQ5 is a 450ma tube, so you're really pushing that one as well.
Congratulations on a major victory putting that missing B+ wire back in place.
Although I can't believe how much time we've been chasing tail because of that very simple oversight.
You really need to post more photo's of your handiwork when asking for advise. My suggestion to you is to take very detailed pictures before you remove any original components so you can refer back to them. And you would do us all a big favor by getting a couple books on understanding very basic DC circuits so you have a better grasp of how to trace voltages in a power supply circuit. Read up on Ohms Law and understand how to apply it.