1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Other Radios (Non-Philco)

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
GM model 120A ser. 7247A (power resistor)
sphamling
Junior Member
**
Posts: 9
Threads: 3
Joined: Sep 2020
City: Valentine State, Province, Country: Nebraska
#1

11-16-2021, 02:27 PM
Hello, I have recently acquired a GM model 120A "The Hepplewhite". Did some cleaning and replacing bypass caps in the metal cans and checking the power resistor/voltage divider found it has an open in the 1st, 3rd and 4th resistors, see the attached photos. Does any one know the values of these resistors?
In the drawing of the voltage divider the 2nd is 60 ohm and the 5th is 450 ohm. One might guess by looking at the spacing of the tabs that the narrow spaced tabs would be the lower values and as the spacing gets wider the resistance would be higher, just a thought. If anyone has some suggestions for the open resistor values it would be greatly appreciated, I only have a couple 10W resistors to work with. I would like to purchase a variety of resistors to keep and at least come close to the values needed to fix this radio.
Thanks, Steve    


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


Messages In This Thread
GM model 120A ser. 7247A (power resistor) - by sphamling - 11-16-2021, 02:27 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
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
Philco model 38 code 121 not receiving signal.
Well why not! :lol:Stormlord5500 — 03:14 PM
Philco model 38 code 121 not receiving signal.
Good luck next thing you know you will be winding coils just for the fun of it. DavidDavid — 11:29 AM
Testing a speaker and output transformer Trutone A2-G
morzh Short-circuited turns can be considered as a half-dead transformer. But on this case transformer will hot and s...Vlad95 — 11:01 AM
Testing a speaker and output transformer Trutone A2-G
I am not sure how a transformer could be weak. It could be inadequate, but only when you replace the original with somet...morzh — 09:56 AM

[-]
Who's Online
There are currently 2184 online users. [Complete List]
» 1 Member(s) | 2183 Guest(s)
Avatar

>
  1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Other Radios (Non-Philco)