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
46-1213 Schematic Question
You have to examine the connections to A and B to see which one matches the schematic. It appears there are two white wi...RodB — 07:39 PM
46-1213 Schematic Question
In the photo of my Chassis, I now have two wires marked "A" and "B", these are my power cord wires. ...MissouriLarry — 02:46 PM
46-1213 Schematic Question
Gary, Thanks for the reply!  I have no intention of introducing any electric to my radio until I recap it.  I just want...MissouriLarry — 02:14 PM
46-1213 Schematic Question
Hi Larry, Usually you'll want to attach the hot side of the power line cord to the power switch. That way when the s...RodB — 02:06 PM
1934 American Bosch 440T restore on YouTube
That's an interesting radio Buzz! Great first video also...Eliot Ness — 01:59 PM
46-1213 Schematic Question
Hello Larry. Replacement of the power cord is a priority, but not the first. All paper and electrolytic capacitors nee...GarySP — 01:36 PM
46-1213 Schematic Question
Ok, now is time to post my first question.  I have a Philco 46-1213 that I am going to start working on here real shortl...MissouriLarry — 12:48 PM
Another amp build - here I go again!
Well, never enough yet how much is too much? I ordered some spare parts from a couple vendors in China and now have ship...TV MAN — 10:49 AM
A Marconi model 86
This Marconi was a bit of a challenge. It was totally missing one electrolytic  capacitor, and the photos show a couple ...Dan Walker — 10:48 AM
Philco 42-345 Restoration/Repair
With regard to the speaker, unless the cone is so brittle that it crumbles as soon as you touch it I would try to repair...Arran — 04:07 AM

[-]
Who's Online
There are currently 467 online users. [Complete List]
» 4 Member(s) | 463 Guest(s)
AvatarAvatarAvatarAvatar

>