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

52-540 tuner
#1

I received this radio and original condition and it was not working. After replacing the capacitors and one weak tube, I now have it playing.. my question has to do with the tuning condenser.. the tension on the dial string pulls it downward so that the large pulley is rubbing on another metal object. See photograph with green arrow. This means that, when I turn the tuning knob, the string just slips and the tuning condenser does not rotate. Using a screwdriver or similar tool I can lever the tuning condenser up, allowing me to operate the pulley, but when I stop pushing with the screwdriver, the string tension pulls the shaft back down. The assembly seems to float within the frame.. What do I need to do to put this back into good operating condition?


Attached Files Image(s)
   
#2

Is it mounted up on rubber grommets? Could be they are shot.

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

Quite often the tuning condenser is mounted on rubber grommets and the grommets are usually dried out or worn flat. I usually replace them with firm rubber grommets to limit movement yet get the isolation.
#4

Thanks, guys. Turns out there are rubber grommets involved, but they are on the sides of the condensor, not the bottom. See brown objects in photos. P all three of these rubber mounts are turning into powder. Acc to the schematic, they are part number 27-4771-1
Any ideas for a good replacement?


Attached Files Image(s)
       
#5

You might check these out: http://www.renovatedradios.com/product.php?product=313  Double check the sizes to see if it is suits your needs. If not have a look around the site maybe there is something that will. GL

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
#6

Thanks GL




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco Model 38-7: what caps & resistors do fail typically?
Hello Martin, Welcome aboard our little community what great Model 38-7 Sincerely Richardradiorich — 12:30 AM
Philco Model 38-7: what caps & resistors do fail typically?
Welcome to the Phorum Martin. I count about 9 paper caps, the 3 electrolytic caps and 2-Y2 safety caps to replace th...RodB — 09:44 PM
Part numbers to model cross
Jim, We have this index put together by Dale Cook but I don't think that is quite what you are looking for. The Parts...klondike98 — 09:37 PM
Philco Model 38-7: what caps & resistors do fail typically?
Yep the dim bulb test is OK but I'd definitely replace all those electrolytics before I did it. Since those #47 conden...klondike98 — 09:18 PM
Philco 42-345 Restoration/Repair
The resistor is a 2.2 Meg, it was the last one I hadn't replaced. The broadcast is coming in after replacing it.osanders0311 — 09:09 PM
Philco 42-345 Restoration/Repair
What does the resistor measure? I think it should be 3.3 Meg. If the oscillator coil has continuity and the resistanc...RodB — 09:03 PM
Philco Model 38-7: what caps & resistors do fail typically?
Good idea to check the coils... then I'll get hold of an incadescent light bulb and see what happens when the unit is sw...Musaeum — 08:49 PM
Philco 42-345 Restoration/Repair
I have that same set, ain't too much shortwave I like anyway.....it is a good AM DX set. PaulPaul Philco322 — 08:32 PM
Philco Model 38-7: what caps & resistors do fail typically?
Welcome to the Phorum, Martin! Open a new thread in Philco Electronic Restoration when you begin working on your 38-7. ...GarySP — 08:28 PM
Philco Model 38-7: what caps & resistors do fail typically?
Welcome to the Phorum! :wave: Here's the schematic for that radio from our digital library: Something to do bef...klondike98 — 08:05 PM

[-]
Who's Online
There are currently no members online.

>