philco 1253

Denver: Did you ever solve the problem with your Philco 48-1253?

Sometimes this is where a O'scope helps out! Starting from the final audio stage and working backward.

I have seen tubes cause this problem. A bugger to track down at times.

Did you solve your distortion problem? If so, tell us so we can know. To add to our bank of fixes. Thanks!

Just make sure you clean the needle from dust or you will have distortion, just ask ME!

We Have got no stinken distortion!!!!!

Thanks will do. Have a bunch old 78,s like to play them , with out distortion .

Try the grid resistors, just a thought.---> If the bias is not correct it can cut off or distort signals. Tube theory is involved here.

Have changed all caps . Pretty sure it is a resistor , but was trying too narrow it down a little.
This set is real confined , Just to check some of the resistors i would have too take some of the caps back out.
Thanks Denver.

I'm not sure off hand, but it seems to me to be a problem related to heat, resistors may change value or actually open, a capacitor becoming leak or opening, Check your B+ when you first turn on and see if its value changes. If it does then suspects would be filter caps, I don't think the choke would be suspect,unless it is passing too much current, and changing resistance, I would suspect tube sockets need checking and solder joints. To be thorough I would check each tube pin for voltage, write down pin # and readings, then go back and do the same after distortion starts.

The difference between readings should give you a clue. To what stage is affected. There are schematics that list voltages, these could be used for a general guide on what to look for. Hope this helps some.

Well glad you clarified about stupid question& answers . I will fit right in
Here is a question ? On a philco model 48-1253 , plays great for about 15 minutes then volume starts getting distorted . Would this be a resistor in the audio stage ,or oscillating circuit . It is a tight set to work on , hard to get to some resistors in a space 4" x 15" about 6" deep.
It has a phono also.