04-06-2010, 05:05 PM
Well, having the speaker disconnected would explain voltages not measuring correctly...
You've learned a valuable lesson, but I will repeat it here for the uninitiated:
Never, ever attempt to operate your Model 111, or any Philco with an electrodynamic speaker, with the speaker disconnected.
Some of the older Philco sets had warnings on their tube layout labels to not operate the set without having the speaker plug in place (which meant to have the speaker connected to the radio).
Now as for the fadeout after 20 minutes.
Remove the big tube shield and watch the radio from the back as it plays. I would bet that one of them is going out after it gets hot. The older, globe-shaped 24 and 27 tubes are especially prone to this problem. I've seen globe shaped 27 tubes with a very pronounced flicker in the filaments. The newer ST (taper-top) 24A and 27 tubes are more reliable and much less prone to having this problem.
You've learned a valuable lesson, but I will repeat it here for the uninitiated:
Never, ever attempt to operate your Model 111, or any Philco with an electrodynamic speaker, with the speaker disconnected.
Some of the older Philco sets had warnings on their tube layout labels to not operate the set without having the speaker plug in place (which meant to have the speaker connected to the radio).
Now as for the fadeout after 20 minutes.
Remove the big tube shield and watch the radio from the back as it plays. I would bet that one of them is going out after it gets hot. The older, globe-shaped 24 and 27 tubes are especially prone to this problem. I've seen globe shaped 27 tubes with a very pronounced flicker in the filaments. The newer ST (taper-top) 24A and 27 tubes are more reliable and much less prone to having this problem.
--
Ron Ramirez
Ferdinand IN
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