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

Linear Mode
Philco 41-601 - hum but no radio sound
BrackenMan
Junior Member
**
Posts: 11
Threads: 3
Joined: Nov 2022
City: Poulsbo State, Province, Country: WA
#14

09-01-2023, 08:34 PM
Okay, not sure where the reply went last night, we'll do it again. 

As shown in the last reply, I'm testing with a modulated 100kHz signal. I'm seeing the IF, the original signal, and the local oscillator. What I'm not hearing is any output from the detector. 

The test signal being sent to the loop is shown in cyan. The output from the mixer (pin 2) is shown in yellow. The input to the detector (pin 5) is shown in magenta. I'm not sure what the periodic bursts from the mixer are - their frequency is about 300Hz. 

Looked for AVC: DC at pin 5 of the detector is -0.47V, at pin 6 is -0.82V. Haven't tried the 3V battery thing yet.


Attached Files Image(s)
   
Find
« Next Oldest | Next Newest »
Thread Closed


Messages In This Thread
RE: Philco 41-601 - hum but no radio sound - by BrackenMan - 09-01-2023, 08:34 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
PT 6 chassis screws size???
Hello bridKarl, that sounds right or maybe 8/32 . Sincerely Richardradiorich — 01:00 AM
PT 6 chassis screws size???
Have this done except for missing chassis screws. It looks like 1 inch 6/32 sheet metal screw may work but can anyone s...bridkarl — 10:32 PM
Philco model 38 code 121 not receiving signal.
Hello Stormlord, Well done on rewinding that coil it turned fairly good for your first one. Sincerely Richardradiorich — 09:12 PM
Philco model 38 code 121 not receiving signal.
Well here it is. It ain't pretty, but hopefully it'll work. I checked it with my DMM on continuity and it keeps and r...Stormlord5500 — 08:56 PM
Philco 42-345 Restoration/Repair
Yes, 57 is an electrolytic cap that should be 12 mfd 400 volts according to the parts list from the Phorum library schem...RodB — 06:01 PM
Philco 42-345 Restoration/Repair
Looks like if I am reading it correctly it looks like the silver capacitor#57 that appears to be a replacement is of a l...osanders0311 — 05:09 PM
Philco model 38 code 121 not receiving signal.
Thanks Arran. Yeah this plastic is pretty thin. It's a little thinner than the original stuff. It kinda reminds me of p...Stormlord5500 — 04:37 PM
Testing a speaker and output transformer Trutone A2-G
The equivalent of one short turn is basically the same as that of a shorted load. If it is the primary's turn, then the ...morzh — 03:53 PM
Testing a speaker and output transformer Trutone A2-G
I've never had an output transformer become shorted, the failure mode is usually an open primary, or in a center tapped ...Arran — 03:52 PM
Philco model 38 code 121 not receiving signal.
As long as the plastic sheeting isn't too thick, I think that the thickness of photographic film would be just about rig...Arran — 03:19 PM

[-]
Who's Online
There are currently no members online.

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