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

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

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, 08:17 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, 11:31 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, 12:12 PM
These are Loctals and I cleaned all of the tubes and sockets.
Website Find
« Next Oldest | Next Newest »
Thread Closed




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
What should I offer?
I have an opportunity to acquire this radio-phono, but the owner wants me to make an offer. Tried searching images, but...nocusr — 12:29 PM
Atwater-Kent 84, restoration.
So, I unwound the coil; it is 700 turns of AWG40 wire. I modeled it on a couple of different calculators and I got about...morzh — 12:29 PM
Atwater-Kent 84, restoration.
Ron From the conversation, it was my impression he was a pretty old dude who is looking to place his radios in good h...morzh — 12:16 PM
Philco 49-1040
Yes, and it's surprisingly common for early TVs to be mostly or all original. My thinking is that they were retired ear...Bob Andersen — 11:59 AM
91H Code 126 Restore
Hi Nick, Usually the dashed lines connected to components means the part is a substitute in the circuit for specific ...RodB — 09:42 AM
462ron
Mike when I got to the guy’s house to pick up the set, he gave me a tour of his home and garage. Wow, his living room co...462ron — 09:10 AM
91H Code 126 Restore
I'm pretty sure that the dotted line I circled in an earlier post signifies that it is applicable to the 226 model which...RealRider — 08:05 AM
Philco 49-1040
Hello bob, that underside looks like it is all original ! Sincerely Richardradiorich — 02:07 AM
Philco 49-1040
Oh yes, many bumblebees and loktal tubes. The cutout is for the speaker.  Here's a photo from a different set. Bob Andersen — 12:59 AM
Philco 49-1040
Bob; Looks like another "Bumble Bee" special, like my Brand Z T.O radios. Is that section they took out of ...Arran — 12:19 AM

[-]
Who's Online
There are currently 4172 online users. [Complete List]
» 1 Member(s) | 4171 Guest(s)
Avatar

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