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 code 128
#1

Greetings all:
I am in the process of completing the basic electronic upgrading on the above model but having some difficulty identifying the value of one of the resistors under the 35Y4 tube. I tried using a 1200ohm 1 watt &, then a 2 Watt but when I play the radio the resistor begins to smoke and burn.
Most items - connections, tubes, other resistor values have be double tested.
The schematics for the code 128 is difficult to locate.
The 46-420 code 121 is readily available but has a different tube layout.
Any suggestions to the possible value of this resistor offered by more experience restorers are most welcomed.
#2

Hi

According to Philco's service information, the added 1200 ohm resistor is rated at 1/2 watt. This version, as you know, does not use an electrodynamic speaker; it uses a PM speaker and two resistors in place of the original field coil.

It sounds to me like you have something in the B+ line drawing way too much current and burning up that 1200 ohm resistor.

I suggest you contact Chuck and obtain the full service information for this set, which includes all of the production change info including Code 128.

http://www.philcorepairbench.com/schematics.htm

Well worth the nominal cost.

--
Ron Ramirez
Ferdinand IN
#3

Thank you for the guidance. The problem was solved.
The 1200ohm resistor was soldered to PIN 8 incorrectly (by me).
It belonged soldered to PIN 5/6.




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
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
Philco model 38 code 121 not receiving signal.
Good news everyone! I think I have found everything I need for rewinding the antenna coil primary. I found some pla...Stormlord5500 — 09:40 AM
Philco Battery-WWII vintage
My younger sister went to SUNY Plattsburg NY, (BS, MS, RN) in the late 1970sabout 10 min from the Northern NY / Canada b...MrFixr55 — 07:59 AM
Philco Battery-WWII vintage
Hello Bob, What Amazing find! Sincerely Richardradiorich — 10:19 PM
Testing a speaker and output transformer Trutone A2-G
Hi Murf, Do this: Monitor between ground and one plate of the rectifier while playing the radio.  Do the same with ...MrFixr55 — 09:51 PM
Philco Battery-WWII vintage
Mike; I take it that Soviet cars did not come equipped with block heaters, hence the hot oil change? Where I lived in...Arran — 08:42 PM

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

>