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 42-340
#1

I have a Philco 42-340 that I have recapped and replaced 2 tubes, everything else looks good.
when powered up all I get is white noise up and down the dial so I stated checking IF coils and all looked good until I got to #32. The one side White and Red I read 32 ohms but what would be the other side Green and Blue I show open. Now this has one of those compact units PC51 (#32 B, C, D) that has a resistor and two caps. I suspect the resistor is open and nothing in the papers I can find gives me a value. I do read  400pf  each for the two caps. I have no idea what the resistor would be? I'm using the Schematics from 340 and 345 as the latter is much better quality and they seem to be the same in this. 

http://www.nostalgiaair.org/Resources/519/M0013519.htm     
http://www.nostalgiaair.org/Resources/521/M0013521.htm
#2

That resistor is typically 47k.

Update:
Hi, I just checked four Philco schematics from 1942 that have that identical circuit and all four have a 47k resistor.
#3

Rod,
Thank you, 
I think I will splice it in and leave the Caps alone and see if that works
#4

Ok turns out the resistor was ok, someone had done a bad job soldering leads on decades ago so when I started making checks at the terminals instead of through the leads I got 52K so I decided to just put new leads on and reassemble. It still did not work so I started checking resistors and not that there were a lot of them but probably 75% were 30-40% or more out. So I changed them and the radio plays fine.

Thanks for the help!

Eric
#5

Best you find those problems sooner than later.




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 46-480 Electronic Restoration
I’m making progress with the alignment. It was a combination of needing to solder the connection on pin 3 of the BC osci...jrblasde — 10:21 PM
Philco 46-480 Electronic Restoration
Mr. Fixr Compared to you I am sooo green behibd the ears...I have about 40 or so sets.morzh — 07:12 PM
48-482 rear panel help
Many thanks to all for the responses! No plastic button "covers" on my radio. Ron, thanks for the chapter on...keithchip — 05:53 PM
Philco 42-345 Restoration/Repair
I am back to working on this radio and managed to get a couple of radio stations to come in. But can someone help me to ...osanders0311 — 01:58 PM
48-482 rear panel help
Hi Kettlechip and welcom to the Phorum. The back panel question is interesting. I have quite a few radios that use pow...MrFixr55 — 08:24 AM
Philco 46-480 Electronic Restoration
Not too much at all! :lol:  Sounds like you’re just dabbling into the hobby!jrblasde — 07:56 AM
Philco 46-480 Electronic Restoration
Hi Joseph, Fortunately, Ms. Fixr does not read my computer, or she would warn you against coming to me for sanity ch...MrFixr55 — 07:27 AM
48-482 rear panel help
There's a picture of one of the plastic covers in the following thread: I bought a full set of them in 2012 or so fro...klondike98 — 11:15 PM
Philco 46-480 Electronic Restoration
Good sanity check! You are correct—the first (as in, the most counterclockwise) position is for the push button presets....jrblasde — 11:05 PM
Philco 46-480 Electronic Restoration
Hi Joseph, First, verify that your band selector is in the correct position for what you want to do. I believe tha...MrFixr55 — 10:59 PM

[-]
Who's Online
There are currently 1009 online users. [Complete List]
» 2 Member(s) | 1007 Guest(s)
AvatarAvatar

>