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

46-420 IF Transformer Issue
#1

Hello all! I'm a newbie to the phorum so excuse my decorum. I have a "Hippo" model that is holding me up. The IF transformer in front & behind the speaker is dead. I need to remove it to replace the caps within. Has anyone else completed this task with success? Power goes in but doesn't come out, so I need to dig in a bit more. Thanks...    
#2

Hello Rich and welcome to the Phorum. First, I love puns and you opened with two, bravo! Next, your IF transformer sounds like an open primary winding. Removing them is usually pretty simple but reinstalling is tricky if you don't mark the can position on the chassis and the relative position of the coil form inside the can. After you get it out use an ohmmeter to determine which winding is the primary and pray you can find a broken or loose wire dangling near a terminal. Sometimes all that's needed is to reflow solder to the terminals to reestablish the connection. If none of this solves the problem then the open is internal to the winding. On rare occasions the wire can be unwound and the break will be a few turns in. Others have replaced the entire can with one from a donor radio but it must be one that has the same resonant frequency. Work slowly and carefully, the wires are delicate. GL
#3

Thanks, Rod! I've worked on Zenith transformers with mica issues before. I didn't know what the process was trying to get the assembly out of the Philco can. There are two gold tabs on two sides. I didn't know if I needed a special tool or what.
#4

looking at your photo i see a bent over tab and theres probably another opposite it on the skirt of the can




Users browsing this thread:
[-]
Recent Posts
philcorepairbench.com - shadow-meter
Anyone know of a way to recover these files from the repair bench? Thanks. fenbach — 11:16 PM
Philco model 38 code 121 not receiving signal.
That's true. Of course If I were to get a vtvm I'd probably have to sink money in to it to get it working right. Probabl...Stormlord5500 — 08:44 PM
Philco model 38 code 121 not receiving signal.
A DMM is good enough. One rarely has to measure indictance, but if you do, short of getting a serious LCR meter (I hav...morzh — 07:35 PM
Testing a speaker and output transformer Trutone A2-G
You guy's are right on. I found a broken wire on the speaker plug that I replaced and all is well now. Have better volu...murf — 03:43 PM
Philco model 38 code 121 not receiving signal.
I need to get a vtvm. I think that little component tester is just more accurate. Plus it shows the inductance which is ...Stormlord5500 — 03:07 PM
Philco model 38 code 121 not receiving signal.
I use a pair of Mastercraft brand DMMs from Canadian Tire, from what I read most of those DMMs use the same main chip re...Arran — 02:36 PM
Philco model 38 code 121 not receiving signal.
Thank you sir. Yes I feel good and also relieved because this one's been weighing on me a bit.Stormlord5500 — 11:18 AM
Philco model 38 code 121 not receiving signal.
It feels good don't it? Good luck on the rest.Paul Philco322 — 11:06 AM
Philco model 38 code 121 not receiving signal.
I've reinstalled the coil. Now IT'S ALIVE!!!!!! I fired up my TinySA on signal generator mode and set it to 1400Kc and ...Stormlord5500 — 11:01 AM
Philco model 38 code 121 not receiving signal.
Yes, Walmart, right up there with Fluke.RodB — 11:00 AM

[-]
Who's Online
There are currently 1967 online users. [Complete List]
» 1 Member(s) | 1966 Guest(s)
Avatar

>