46-420 code 128 - Printable Version
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46-420 code 128 -
decoflair - 08-18-2011
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.
Re: 46-420 code 128 -
Ron Ramirez - 08-18-2011
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.
Re: 46-420 code 128 -
decoflair - 08-20-2011
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.