[Tucker]

Do you typically replace the older Philco resistors ?  I’m referring to the ones that Philco used in the 30’s and early 40’s radios? I recall reading a post a while back where someone mentioned these resistors usually are not as reliable as others. 
I’m asking because the Philco 40-180 console that I recapped a few years back started to lose the signal after about 45 minutes of playing. I tested and swapped out the tubes and the issue was still there. I then decided to replace the original resistors that tested good when I recapped the radio and the radio plays good now. 
I did find that one of the original resistors had a hairline crack that wasn’t visible as it faced the chassis.

[radiorich]

Hello Tucker,
Well I personally only replace the resistors that are bad !
The very early ones are called Dog Bone resistors because their shaped like a dog bone .
Sincerely Richard

[GarySP]

Hello Tucker. I usually replace all resistors, even if they test correct. I barely find time to get into the radio once, so all caps and carbon get replaced. Probably overkill, but it is inexpensive overkill. Take care and BE HEALTHY! Gary

[David]

Over many years at this hobby now replace them all. Have found sets that all were high others only 1 or 2 and then down the road back working on replacing the others. Posting a link to some info on resistors, well might say blowing my own horn.  https://philcoradio.com/phorum/showthrea...#pid177816

[morzh]

I only replace those badly out of tolerance.
Those within 50% I parallel with a newer one, hidden under the original.
Those within 25% I simply ignore.