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

F-1740 Alignment/Diagnostic Advice Needed.
#1

I have recapped and changed resistors as required, installed a solid state vibrator and added new buffer cap. I have 212v at the rectifier. The manual oscillator coil was open, fixed that and the tuning condenser came to life. My problem is that I can only receive at 1570 kc and 1120kc at the same time and nothing else anywhere on the dial. When the presets are selected, nothing on the first 2 (580 to 1050kc) 3 is a weaker version of 4 and 5 (900 to 1580) which are loud and clear with 2 stations which sounds exactly like manual dial. The 1570 is a very strong local station. I noticed that the 2 station I receive are 455 kc apart. Alignment? The Philco sheet says to send 455kc thru .1mf cap to the antenna receptacle. I did that and the maximum output is where I have it, but no change in reception. I really like to figure as much of this kind of stuff out myself, but this beyond my diagnostic ability. Thanks for your thoughts
#2

Double check to see that the oscillator is running. You should have a little bit of - voltage on the control grid of the mixer tube like a volt or 2.
Terry

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco model 38 code 121 not receiving signal.
So one last question before I finish this radio. Regarding the speaker and output transformer. I salvaged the original o...Stormlord5500 — 09:31 AM
462ron
It’s on the bottom of the homepage of our Philcoradio.com homepage! Ron462ron — 07:20 AM
Model 70 Cabinet Trim
Steve might have some trim left. Not sure he is making anything.morzh — 06:12 AM
Model 70 Cabinet Trim
Hello musar, First all welcome to the forum and yes that is true that steve stopped making trim . Sincerely Richar...radiorich — 12:13 AM
Model 70 Cabinet Trim
I have recently come into possession of a Model 70.  The trim around the base needs to be replaced.  If this were years ...musar — 12:07 AM
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

[-]
Who's Online
There are currently 446 online users. [Complete List]
» 2 Member(s) | 444 Guest(s)
AvatarAvatar

>