02-18-2009, 11:59 PM
Hello All,
I have a Philco cathedral model 90 with one 47 tube. Somebody who had this radio before me did some work to repair/modify the set. In doing so, they jumped a number of the caps by wiring the connection out side of the bakleite blocks. To do this, they cut off some of the lugs, making my job tougher, as I am trying to restore the chassis back to original wiring. I have the schematic, the diagram showing where the major components are and a parts list. I have rebuilt several of the bakelite blocks and have been able to figure out and properly replace the caps in the blocks, solder them to the correct lugs, resolder the cut off lugs where necessary and re wire several resistors back to their correct location.
My problem is with C 18 and the correct location of several resistors and other connections. Parts list shows C-18 as 3903-M with condesor lugs used at #4 and #7 lugs. Additional lug used is # 8. R 50 is supposed to be connected to lug#7 and one of C-30 conection to #7 as well as R 49 (coming all the way from the RF socket). R 17 is supposed to be connected to lug 8. However, I do not see a wire from the cap inside the block soldered to lug 8 but to lug #7 instead. Lug 4 does have a cap wire attached. Also, R 50 is connected to lug 8 along with R 17 and R49. C- 30 should go to 7, but is connected to 8. I have noticed that someone scratched an R into the side of the block, which could mean someone made a mod, because a 3903 R does use lugs 7 and 4. But doesn't this change the resistor and other cap connections? How should I proceed?
I know this was a long post, but I had to describe my challenge in detail. This one ball of confusion!
I have a Philco cathedral model 90 with one 47 tube. Somebody who had this radio before me did some work to repair/modify the set. In doing so, they jumped a number of the caps by wiring the connection out side of the bakleite blocks. To do this, they cut off some of the lugs, making my job tougher, as I am trying to restore the chassis back to original wiring. I have the schematic, the diagram showing where the major components are and a parts list. I have rebuilt several of the bakelite blocks and have been able to figure out and properly replace the caps in the blocks, solder them to the correct lugs, resolder the cut off lugs where necessary and re wire several resistors back to their correct location.
My problem is with C 18 and the correct location of several resistors and other connections. Parts list shows C-18 as 3903-M with condesor lugs used at #4 and #7 lugs. Additional lug used is # 8. R 50 is supposed to be connected to lug#7 and one of C-30 conection to #7 as well as R 49 (coming all the way from the RF socket). R 17 is supposed to be connected to lug 8. However, I do not see a wire from the cap inside the block soldered to lug 8 but to lug #7 instead. Lug 4 does have a cap wire attached. Also, R 50 is connected to lug 8 along with R 17 and R49. C- 30 should go to 7, but is connected to 8. I have noticed that someone scratched an R into the side of the block, which could mean someone made a mod, because a 3903 R does use lugs 7 and 4. But doesn't this change the resistor and other cap connections? How should I proceed?
I know this was a long post, but I had to describe my challenge in detail. This one ball of confusion!
, but then again, I did not check it each time I put in a new cap or re arranged the wiring back to original RATS! I noticed also that the RF 27 tube does not appear to light up. How did I manage to screw that up? The radio was working before I started the recap/re-wire process, but had significant oscillating problems and sound was very uneven a not very clear (which is the major reason I wanted to do the recap)