40s Philco 40-145 BUMMER!

[NoPegs]

Edit: You did say you tested them after the oops. For more than just emissions? I still feel like the output tube took internal damage in the process.

Have you... tested... the output tube after your lapse of cognizance?


Motorboating and lack of volume control could be a burnt up 7B5. ~200VAC (actually probably ~400VAC) applied across the grid and screen will arc or melt them... Plus ~200VAC grid to cathode probably has similar results...

[Tubejunke]

Originally Posted by NoPegs

Have you... tested... the output tube after your lapse of cognizance?

Yes, I tested the tubes after my idiotic mistake. LOL! In my defense, I just bet I'm not the first person to put a tube in the wrong socket! The 7Y4 rectifier tested odd in that it would go high on the scale initially, then back way off into the red or bad. A replacement not any other rectifier that I have tested ever tested quite that way. I am going to try it in the working set I borrowed it from just to note the effect. Also, I jumped a few small value caps as everything is original old waxies. No differences there...

Earlier I hooked up the two sets of antennas as I noted that they had trimmer capacitors on them and I knew that Philcos of this design are notorious for having issues without the antenna hooked up. I was startled by the sound (finally) of some evangelist screaming about the voice of God rushing from my speaker at full volume! So, I am getting somewhere.

Evidently I wired the volume potentiometer up wrong as its full volume all the time. I checked the pot of course and it's within specs. The old one was fully open as I cracked the lid in hope of repairing it, but the carbon was just eaten away at both ends. I created this post mainly to tap this wonderful pool of knowledge about what could or did happen in such a case. Also, having a few nice old Philcos' I thought that others interested in them might chime in with other good info., stories or whatnot.

I'll update as progress continues.....

[Tubejunke]

Still more luck. I discovered that I forgot to ground the potentiometer. The radio now plays on AM. There is still "Police" and Shortwave that I have not really gone through much, but this set has come a long way.

Thanks NoPegs for the tips. I thought perhaps these radios would be more popular than the low feedback dictated here. Anyway, I am happy with all the results.

[WISCOJIM]

Originally Posted by Tubejunke

I thought perhaps these radios would be more popular than the low feedback dictated here.

You'll find a whole lot more response for radio issues over at http://antiqueradios.com/forums/index.php

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