Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Confusion with Philco 32A (Canadian) Electrolytic
#1

http://pacifictv.ca/schematics/philco32manual.pdf

I was going to replace Part #25 a duo cap 10 mfd electrolytic. As pic 1 shows the red wire has previously been cut and another 10 mfd cap been installed elsewhere. My confusion is with what’s left of that duo cap. The yellowish wire on pic 1 goes to pin 4 of the 80 tube. On pic 2 the #1 wire goes to ground and the #2 wire goes to pin 4 of the 7B5E tube which I believe is just a connection point. 

Should I connect both #1 and #2 wires to the negative side of my new electrolytic. It’s confusing me since I’ve only had to connect one wire to the - side of any electrolytic I replaced before. I’m still relatively new to this hobby. 

Any assistance is greatly appreciated.


Attached Files Image(s)
       
#2

Neither of the +'s or -'s are connected together. #25 on the left connects to one of the fat pins on the 80 tube (pins 1 or 4). The + side. The - side connects to red/yellow wire from the power transformer. This wire is all so known as the hv center tap.

#25 on the right + connects to the field coil (red/black wire) and - connects to chassis ground.

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
#3

Terry, is it possible that they used Pin 4 of 7B5E as the hv center tap? I traced the red/ yellow from the transformer and that’s where it terminates.
#4

It's possible it's not connected internally in the tube. You can check it by measuring it's resistance against the to skinny pins on the the 80 tube. Should be about equal.

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
#5

Hi Phil.  I think if you look at the info on the old cap, your #1 wire is black and is the negative for the red positive wire that has been cut.  The previous restorer just didn't cut the neg. wire.  It wouldn't matter since the pos. was cut and is no longer in circuit.  So I think you could just cut the black wire and take it out. Now the yellow positive that is left has a green negative(#2) and you can go from there.  If I'm I hope someone here like Terry will correct me.

  Dick
#6

I believe you’re correct Dick. I disconnected the black wire and connected my new cap to the yellow + and green - . Why the person before me didn’t cut the black wire out was confusing me. I always get advice from the more learned members on the Phorum. Thanks to all.




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Correct model 84 Ac plug an cord type
Hello Arran Yes, I also like the lampshade style plug ! Sincerely Richardradiorich — 08:46 AM
Restoring Philco 38-14
Hello morzh, Nice explanation on the x and y capacitors and glad you are narrowing down the issue with this set ! Si...radiorich — 08:43 AM
Correct model 84 Ac plug an cord type
From what I read Philco went to using brown rubber power cords in 1936, so cloth was used in the 1935 and earlier models...Arran — 11:25 PM
Correct model 84 Ac plug an cord type
Hi Bruce, I have not worked on an 84, but in general, power cords for almost any radio prior to 1938 was cloth covered...MrFixr55 — 08:34 PM
Restoring Philco 38-14
OK, well, so after staring at the sch again, I realized the problem had to be the #12/12A padder. I put a scope on the o...morzh — 08:15 PM
Correct model 84 Ac plug an cord type
Hello Bruce, I mostly use brown far as my cloth powercords go ! Here is the plug that I have used bakelite Acorn style...radiorich — 08:05 PM
Correct model 84 Ac plug an cord type
Looking for as correct as can find the right Ac plug an the correct colored cloth line. Ive seen many old photos but mos...Bruce — 04:13 PM
Restoring Philco 38-14
Rod Two Y-caps make sense if you use them from L/N to the chassis; this is only makes sense in the transformer radios...morzh — 10:11 AM
Restoring Philco 38-14
Mike, I'm curious about a specific use of he Y cap. Lately I've seen a single cap across the power transformer primary. ...RodB — 09:01 AM
Restoring Philco 38-14
hello morzh , That sounds like a plan ! Sincerely Richardradiorich — 07:45 AM

[-]
Who's Online
There are currently 3230 online users. [Complete List]
» 1 Member(s) | 3229 Guest(s)
Avatar

>