Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Restoring Philco 38-12 in a wood cabinet
#3

Today I replaced or parallelled (if the deviation was not too large) the resistors.
One particular resistor puzzled me for a while.
It showed 7.3M and it should've been 190K. I 've seen my share of open resistors...but the radio worked fine.
I have another chassis I keep on the bench for reference; it was acquired independently about 2 years ago for $5. In good shape.
So, I looked at the same resistor there, and it showed....10M. I started doubting myself. I even thought it was some variation. I tried to look for 190K resistor but to no avail. Then I measured the voltage on the plate of the IF, where that resistor was the load, and saw 20V instead of 90V.
So I replaced it, and the voltage came back normal. The radio worked the same way as before.
I never saw two resistors in two chassis failed the same way. Bad batch?


Spare chassis' resistor
   
Its resistance
   

My chassis' resistor
   
Its resistance
   


Now just replace the electrolytic caps.

People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.


Messages In This Thread
RE: Restoring Philco 38-12 in a wood cabinet - by morzh - 08-19-2024, 10:16 PM



Users browsing this thread: 2 Guest(s)
[-]
Recent Posts
6TPZ and 5TPO Radio Help
Welcome to the Phorum, R3Sons! I have very limited experience with car radios other than installing custom radios back ...GarySP — 01:08 PM
462ron
OK, I need to rename this thread to say..Eico 368 TV/FM Sweep Generator instead of the current title..Heathkit Sweep Gen...462ron — 12:49 PM
6TPZ and 5TPO Radio Help
Hello, I have a Philco (Ford) 6TPZ and a 5TPO radio.  I replaced the electrolytic capacitors in both.  I have the SAMS m...R3Sons — 12:29 PM
The list of my radio & TV collection!
Hello Peter, Thank you for posting that !! Sincerely Richardradiorich — 09:40 AM
Eico 232 VTVM Schematic
It's a microwave antenna. ?;-p?. I substituted 1N4002s off the 6.3 vac winding for the 1.5 volt battery. Uniprobe is the...RodB — 05:50 PM
Eico 232 VTVM Schematic
Try BAMA for a schematic. Looks like a replacement power source for the D battery has been installed. The tube may be...Chas — 04:51 PM
Eico 232 VTVM Schematic
Is that a battery holder?morzh — 04:43 PM
Eico 232 VTVM Schematic
A friend gave me this Eico 232 VTVM and I'm having trouble locating the schematic for it. This one seems to be a later v...RodB — 04:17 PM
Var resistor id
Considering what it is in series with, I doubt there should be any power requirements. Of course, we should know wher...morzh — 03:23 PM
Var resistor id
Trim pot, about 1/2 watt part of focus divider. As stated 2k ohms. This appears to be a rusty chassis, resolder all ...Chas — 03:19 PM

[-]
Who's Online
There are currently 7896 online users. [Complete List]
» 2 Member(s) | 7894 Guest(s)
AvatarAvatar

>