[davidff]

This radio worked fine after recapping the electrolytics and replacing the 6X5.  Suddenly it got quiet, now no sound other than a very faint speaker hum.  The power transformer is cool, so I do not think there is any short.  Can someone assist me with how to take voltages on this?  I have a multimeter but never measured voltages.  Perhaps the transformer is not putting the voltage out?

Thanks for reading.

[Eliot Ness]

You mention recapping the electrolytics, but did you replace the other capacitors and check for out-of-tolerance resistors?

Your location is not listed so I'm not sure if there is a local radio club that could help you out or not. I just hesitate to have someone who has never measured voltages poking around in a live radio chassis. I don't want your first experience using a meter to be your last! What schematic do you have? The one listed on Nostalgia Air is pretty hard to read:

http://www.nostalgiaair.org/PagesByModel...013533.pdf

[klondike98]

Hi davidff,
John has some good advice and all in the Phorum will need to have their town and state added by June 1 so please go to the "User CP" then "Edit Profile" and update the information.

If only the electrolytics were recapped, the wax/paper caps could easily have failed.

[davidff]

I replaced most of the paper caps,  I believe only 2 were left which I should replace.  I did not do anything with the resistors, assuming they would only cause distortion, not an "open" situation.

[klondike98]

There is a clearer schematic on the audiophool site. Resistors do tend to drift to higher values but can also fail open.

[Eliot Ness]

There is a clearer schematic on the audiophool site.........

That is a much, much better schematic, but it requires DjView to open.  davidff, if needed I can convert it to PDF and e-mail you a copy.  With the better schematic you can pull the 6X5 and take some resistance measurements on your power transformer and also check your resistors.

[klondike98]

Elliot Ness wrote: pull the 6X5 and take some resistance measurements on your power transformer and also check your resistors

...that would be with the radio UNPLUGGED

[morzh]

David

Do you have a tube tester?
There can be many reasons. Tubes - one of them. It is unlikely your transformer. This is not a typical way they quit (possible but rare).

Do what John suggested. Then test the tubes. Especially you need to test 6X5.

One thing I would suggest myself: (after you do what John said) as you said, the radio does not smoke and the transformer is cool. If this is the case you could try to measure the B+ as it is. Measure it across the 8uF (I think it is 20A cap, the one after the field coil), between its chassis and the positive terminal.

[davidff]

I will do that measurement that you suggest. I re-tested and substituted all the tubes and replaced every bypass cap except one that is in the XX tube area where it is a very tight area to work. The radio makes no sound other than a very quiet hum that you can hear only if you put your ear up to the speaker. It was playing perfectly clear and loud before it just quit on me.

[jerryhawthorne]

David might I suggest going to Chuck's site for the best and clearest information on Philcos. I never start a Philco without Chuck's information package.
Jerry
http://www.philcorepairbench.com/schematics.htm