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
41-605 Squeal/Motorboat
glwells
Junior Member
**
Posts: 15
Threads: 5
Joined: Aug 2009
City: Columbus State, Province, Country: NC
#1

10-28-2021, 07:17 PM
I'm working on a 41-605, replaced the obligatory caps as well as some dominos, out of spec resistors, checked tubes, general socket and pot cleanups, etc. The AM side plays fine up to about 1400 where the oscillator starts the infamous squeal and motorboating right up thru the top of the dial. All good below 1400. The SW side works fine with no issues. I have it isolated to most likely issues with the oscillator circuit. A NOS 14AF7/XXD didn't help. Resistance specs of the oscillator coil are good. I've maneuvered lead and component placement as much as I dare in the oscillator area around the XXD. Oscillator padder 17A does impact the intensity but doesn't eliminate it. Can anyone offer any suggestions or hints as to what I may have missed?

Much appreciated.

Gary
WB9AYD
Website Find
vinzer
Member
***
Posts: 214
Threads: 16
Joined: May 2010
City: Kokomo, IN
#2

10-29-2021, 10:31 AM
Are all tube shields on?
Find
glwells
Junior Member
**
Posts: 15
Threads: 5
Joined: Aug 2009
City: Columbus State, Province, Country: NC
#3

10-29-2021, 11:12 AM
These are Loctals and I cleaned all of the tubes and sockets.
Website Find
« Next Oldest | Next Newest »




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Jackson 665 j2 schematic request
FIXED!daveone23 — 03:55 PM
Bakelite crack repair - what is best epoxy?
Thanks everyone. I appreciate you sharing your experience and looks like I'll work with the 24 hr two part clear epoxy....de371 — 10:25 PM
Jackson 665 j2 schematic request
Without a schematic its going to be hard tracing the wire wound spool resistors.daveone23 — 05:21 PM
Jackson 665 j2 schematic request
Looking for a schematic for the 665 j2 multimeter.daveone23 — 04:42 PM
Looking for place to donate unique Philco Philco J-1930 Prototype
>>I'll write to the Henry Ford. I heard, his secretary answers his mail, not he himself.morzh — 12:15 PM
Philco 48-200 alignment questions
Just checked the power cord and I did in fact wire it so the hot side (small prong) goes to the switch.transitony — 11:52 AM
Looking for place to donate unique Philco Philco J-1930 Prototype
Thanks for the suggestions.  I'll write to the Henry Ford.   That would certainly make sense since by the time this prod...jeibner — 11:49 AM
Looking for place to donate unique Philco Philco J-1930 Prototype
For what it's worth, the Henry Ford Museum and Greenfield Village in Dearborn, Michigan may be an option. The obvious ...GarySP — 11:39 AM
Help with Readrite 410 tube tester
Mike and I just had a short discussion yesterday about this very subject. So often it's the connections. Ya gotta have t...RodB — 10:08 AM
Looking for place to donate unique Philco Philco J-1930 Prototype
We have a regional museum here in the Twin Cities called The Pavek Museum. They have an extensive collection of communic...RodB — 09:30 AM

[-]
Who's Online
There are currently 3114 online users. [Complete List]
» 1 Member(s) | 3113 Guest(s)
Avatar

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