Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Need help with a Philco 42-350
#2

Did you rebuild the IF cans? There is a 4000 uuF mica capacitor inside the 1st IF that goes between the XXL plate and the band switch. You can probably test it if your meter has a capacitance function. If you didn't rebuild the cans, there might be some rotten wire that should be replaced.

When there is an intermittent problem that is solved by the touch of a meter, I usually suspect some unwanted capacitance somewhere, either because of an open resistor that normally bleeds off a charge, or because of a bad contact. Try cleaning the band switch and push-button switch block with something like deoxit. Double check your solder joints. Sometimes old wire will look like it has soldered, but really makes poor contact with the solder.

I actually have a similar problem with a 42-355 that I listen to almost daily. The push-button stations will suddenly go away but will come back when I push any of the other push buttons and then switch back to the station I was listening to. I cleaned the switches before I put the chassis back in the cabinet, but the problem developed not too long after. I haven't had a chance to take it apart yet because of other projects, but I'll do it soon.

Let us know what you find out, because it might be related to the problem with my radio.

John Honeycutt


Messages In This Thread
Need help with a Philco 42-350 - by wmcpherson99 - 09-23-2015, 12:26 AM
RE: Need help with a Philco 42-350 - by Raleigh - 09-23-2015, 12:04 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Zenith H725
David - I think I understand but what units are you discussing (Low of 1.7, high of 3.9)? Budget constraints for Ham ...EdHolland — 01:43 PM
My Philco 37-116 Restore
You're doing great. I wish I could be more involved, but my mind is right now preoccupied with the reason I am here in ...morzh — 12:21 PM
My Philco 37-116 Restore
Hope you guys are still with me. I have moved on to the alignment. I completed the IF alignment which was pretty muc...dconant — 10:47 AM
My Philco 37-116 Restore
Hello MrFixr55, Thank you for taking the time to explain. I measured 50 volts where you say. Today the 370 volts at ...dconant — 12:51 PM
462ron
Oh that sucks. It’s something easily overlooked. Hopefully it’s nothing more than a resistor! Ron462ron — 08:08 AM
Philco 46-480 Electronic Restoration
Just confirmed that you are correct. It’s the function generator. I connected the signal output probe to one of the inpu...jrblasde — 07:52 AM
Philco 46-480 Electronic Restoration
Ouch, you may be right. Yes, it is solid state. It’s the signal output of my oscilloscope. May be time to crack that ...jrblasde — 07:27 AM
462ron
If you didn’t put a DC blocking cap between the signal generator probe and the plate of the 1st IF it’s possible you ble...462ron — 07:07 AM
My Philco 37-116 Restore
Hi DConnant, The reason why C127 is isolated from ground is because sets of this vintage did not have the center tap...MrFixr55 — 01:07 AM
Philco 46-480 Electronic Restoration
The shield is on the 6H6. It was, in fact, a missing jumper to connect the main chassis ground to the RF chassis grou...jrblasde — 10:58 PM

[-]
Who's Online
There are currently 1035 online users. [Complete List]
» 1 Member(s) | 1034 Guest(s)
Avatar

>