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

Philco 48-250
#1

Hi, all.  So I recapped this set a while back and had all kinds of problems with whistles and stations coming in all over the dial.   I went back through it today.  I did an alignment and it's much better, but not right.  590 comes in well, but can be heard through much of the the lower end of the dial though quietly.   950 and 980 come in and it seems okay above there through the rest of the dial.  The antenna trimmer doesn't really peak.  tightened all the down it drops and as you back it off stations come in better, but it doesn't peak.  The IFs peak.  I used orange drops for all of the non-electrolytic  caps and ceramic disks for C401 and C201.  New electrolytics.  Any ideas?
#2

Sounds like you've got a problem with the loop ant. Not connected to the proper terminals.

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
#3

I don't see how I could have connected the loop antenna incorrectly. One side connects to a terminal on top of the tuning gang and the other connects to a terminal nearby with a wire that goes inside the chassis. I followed it and it goes to the IF cans like the schematic shows. No other places to connect. The loop has continuity, so no broken wire in the loop.
#4

Quote:MarkinK-zoo The antenna trimmer doesn't really peak.
That is a sign there is a problem in associated circuits with that trimmer...

Do the circuit troubleshooting in that area with a conventional analog VOM.. Continuity with a DVM could be misleading. Most ANT/RF coils have a low resistance. Look for ground to chassis via rivets, solder them to the chassis using an active flux and an iron with a large copper bit (bolt)... GL  chas

Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”




Users browsing this thread:
[-]
Recent Posts
The list of my radio & TV collection!
Magical chords of forgotten melodies, old nostalgic music on an old radio... Saturday night blues on the Mid-Waves on an...RadioSvit — 12:20 PM
Philco 42-345 Restoration/Repair
Thank you MrFixr55 the issue with this radio is that the internal coil antenna is missing and there was a wire in its pl...osanders0311 — 11:34 AM
Philco 610B oscillator wiring
Regarding the oscillator circuit which is comprised of the 6A7's cathode, control grid, and screen grid. These elements ...Radioroslyn — 10:33 AM
Philco 42-345 Restoration/Repair
Hi OSanders, First off, welcome to the Philco Phorum where Phine Phamily-Phriendly Pholks Phull of Philco Phacts and P...MrFixr55 — 08:41 AM
Philco 42-345 Restoration/Repair
Today I've been reading through the site trying to learn more about this radio. I also soldered the lose power cord cabl...osanders0311 — 08:24 PM
Philco 610B oscillator wiring
Thanks David! I do have that same later prodution model 610 schematic. I've also studied the Philco service bulletins fo...Tubester — 08:12 PM
Philco 610B oscillator wiring
Some info from Beitmans says late production. David   David — 06:06 PM
Restoring Philco 96
Oh wow! Just found this thread.  Brings me back to early days on this phorum.  I did a 96 back in 2017.  Thread here: ...rfeenstra — 06:05 PM
Philco 610B oscillator wiring
Thanks for the replies. It's not the really the hum that I am after. Just trying to understand why only the shortwave ba...Tubester — 04:01 PM
Restoring Philco 96
70 and 90 are Superhets, but at least the 2x45 model of 90 uses the Plate detector (and so does 70). Also the Atwaters,...morzh — 03:28 PM

[-]
Who's Online
There are currently 3833 online users. [Complete List]
» 1 Member(s) | 3832 Guest(s)
Avatar

>