|
I have found the schematic for a Philco model 48-460 which uses a PM speaker and the same case as yours.
The filter network in this radio is a 30ufd on pin 7 of the 35Y4, a 220 ohm resistor, a 25 ufd cap, then a 1200 ohm resistor, and finally another 30 ufd cap.
The speaker output transformer is tapped into the center 25 ufd cap. The rest of the radio is powered from following the 1200 ohm. See below.
***************** --------------- to audio out transfromer.
*****************|
***********220***|****1200
35Y4 -------\/\/\/\/------\/\/\/\/-----to rest of radio
******|***********|*******|
******----*30*****----- 25 *----*30
******----********----- ***----
******|************|*******|
******---------------------------
******************|
****************------
*****************----
******************--
The tube lineup is 14AF7, 7B7, 7B7, 7C6, 50L6, 35Y4. Please excuse the *s, for some reason when I posted, my spaces in the picture were wiped out so I replaced them with *.. Probably related to crappy Microsoft software.
Last edited by peverett; 10-31-2009 at 01:23 PM.
|