1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Threaded Mode
FM motorboating on Philco 48-482
Micro9
Junior Member
**
Posts: 36
Threads: 15
Joined: Aug 2007
City: Glendale,AZ
#1

11-01-2009, 10:34 PM
Need help on a Philco 48-482.BC and SW work great after recap but FM is very weak and motorboats when volum is rasied.FM was bad before I recapped it.All resistors are with in tolerance around the FM1000 and 7B6 tube.....Any ideas????
Find
Micro9
Junior Member
**
Posts: 36
Threads: 15
Joined: Aug 2007
City: Glendale,AZ
#2

11-02-2009, 11:53 PM
FIXED.....One of the "NEW" E-caps I put in went belly-up....Checked it before I put it in..It checked good...went belly-up after the power hit it.....
Find
exray
Phorum Expert
*****
Posts: 893
Threads: 9
Joined: Mar 2008
City: Vieques, PR USA State, Province, Country: PR
#3

11-03-2009, 09:00 AM
How did you pin it down? Did it swell up or pop?

-Bill
Website Find
Micro9
Junior Member
**
Posts: 36
Threads: 15
Joined: Aug 2007
City: Glendale,AZ
#4

11-03-2009, 02:34 PM
No I used my ESR meter and started from scratch again....Per the Schematic (I) part of the old Cap went to filter the FM.I cut the orginal cap out of the ckt before I put in a new cap in its place.....The cap looked just Like new but was shorted....
Find
codefox1
Silent Key
*****
Posts: 2,128
Threads: 18
Joined: Oct 2008
City: Merrick, Long Island, NY
#5

11-03-2009, 06:29 PM
Interesting. I have seen problems with motorboating caused by an open filter capacitor quite a few times, but a shorted one would either burn up the dividing resistor or cause the stages fed by it to cease functioning. Glad you got the set working again, but I'm afraid I missed something.
Find
Micro9
Junior Member
**
Posts: 36
Threads: 15
Joined: Aug 2007
City: Glendale,AZ
#6

11-03-2009, 09:13 PM
There was a 3300 ohm R404 that was also burnt. It wasn't open but was @3.5 meg and I replaced that also....
Find
« Next Oldest | Next Newest »




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Hickok AC51 tube tester
Note that no power cord, power switch, or power transformer switch are shown. That (along with my experience with full s...DaleHCook — 07:09 AM
IF can wire size and Rubber mounts?
A pair of wire strippers can give you an idea of what the existing gauge of the wire leads are in the IF can, I think it...Arran — 06:07 AM
My last cabinet for this year
Hello Dan, That is really beautiful what great looking radio you have ! I have friends who live in Calgary and the wea...radiorich — 01:51 AM
12' Philco
Not anymore Mike. Andre The Giant Born: May 19, 1946, Coulommiers, France Died: Jan 28, 1993 (46 years), Paris, Fran...RodB — 11:53 PM
IF can wire size and Rubber mounts?
Renovated Radios do carry what you need. As for the voltage, a wire should be at least 300V-rated.morzh — 11:13 PM
12' Philco
Andre the Giant got 2" on Kareem :lol:morzh — 11:11 PM
IF can wire size and Rubber mounts?
Thanks for the info but I doubt that a hardware store would be carrying the proper tuner assembly support mountings for ...georgetownjohn — 10:38 PM
12' Philco
Perhaps Kareem Abdul Jabbar?GarySP — 10:33 PM
My last cabinet for this year
Outstanding work, Dan! Take care and BE HEALTHY! GaryGarySP — 10:31 PM
My last cabinet for this year
They are a nice looking radio, Stromberg. I have a small tabletop octagon-dial one. It sounds surprisingly nice. And t...morzh — 09:40 PM

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

>
  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration