04-02-2007, 07:48 PM
If it's the 150-390 KC band that doesn't work, it's usually not worth the effort to make it work. There's really nothing to hear on that band these days. There's a chance it's working and you just don't realize it!
When working, the 640 is a super sounding, sensitive radio. I've got a 640 and 650 along with a spare recapped working 645 chassis (and a host of other Philco's).
If the audio develops intermittent static, jiggle the audio tubes (42's) to see if corrects (temporarily). These tubes run very hot and the tube sockets oxidize over time. The best solution for this is just to change the sockets - cleaners and deoxidizers just won't cut it.
When working, the 640 is a super sounding, sensitive radio. I've got a 640 and 650 along with a spare recapped working 645 chassis (and a host of other Philco's).
If the audio develops intermittent static, jiggle the audio tubes (42's) to see if corrects (temporarily). These tubes run very hot and the tube sockets oxidize over time. The best solution for this is just to change the sockets - cleaners and deoxidizers just won't cut it.
Pete AI2V
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