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

Philco Model 41-296X with 41-285 modified chassis
#57

Ron Ramirez Wrote:Okay, now we're getting somewhere. You say you replaced the input filter capacitor (62), Philco part number 30-2474, with a 10 uF, 160 volt unit. Big mistake! 160 volts is much too low a voltage rating for this capacitor! According to the schematic, 265 volts is being applied across this capacitor when in operation. And, keep in mind that those voltages were measured with 1941 or older vintage test equipment which is not as accurate as today's high impedance multimeters; so that 265 volts is probably more like 280 or 290, given today's more sensitive meters and higher line voltages.

I would bet that this capacitor shorted since it was only rated at 160 volts, and the short took out the power transformer since this is the input filter.

Replace it with a new electrolytic rated at 10 uF, 450 volts.

It will not matter if you replaced electrolytic (27) with 22 uF, although 10 uF would have been a better choice. Replacing the 16 uF (27A) with a 22 uF was the right thing to do. You say the new ones were rated at 450 volts, so all should be OK there.

I have a 41-285 that I'm going to restore. I've been scouring this forum and without it I don't believe I would or will be successful. Anyways my question is I was looking at the schematic for the radio and it says that capacitor (62) was 12 uF. I thought I read that you should go up and not down in ratings. Should I get a 10 uF or would the 22 uF be better as Ron suggested the 10?

I just want to get this right as I have only begun this journey.

Dan


Messages In This Thread
Re: Philco Model 41-296X with 41-295 modified chassis - by dfields - 11-16-2010, 05:19 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 42-345 Restoration/Repair
Yes, 57 is an electrolytic cap that should be 12 mfd 400 volts according to the parts list from the Phorum library schem...RodB — 06:01 PM
Philco 42-345 Restoration/Repair
Looks like if I am reading it correctly it looks like the silver capacitor#57 that appears to be a replacement is of a l...osanders0311 — 05:09 PM
Philco model 38 code 121 not receiving signal.
Thanks Arran. Yeah this plastic is pretty thin. It's a little thinner than the original stuff. It kinda reminds me of p...Stormlord5500 — 04:37 PM
Testing a speaker and output transformer Trutone A2-G
The equivalent of one short turn is basically the same as that of a shorted load. If it is the primary's turn, then the ...morzh — 03:53 PM
Testing a speaker and output transformer Trutone A2-G
I've never had an output transformer become shorted, the failure mode is usually an open primary, or in a center tapped ...Arran — 03:52 PM
Philco model 38 code 121 not receiving signal.
As long as the plastic sheeting isn't too thick, I think that the thickness of photographic film would be just about rig...Arran — 03:19 PM
Philco model 38 code 121 not receiving signal.
Well why not! :lol:Stormlord5500 — 03:14 PM
Philco model 38 code 121 not receiving signal.
Good luck next thing you know you will be winding coils just for the fun of it. DavidDavid — 11:29 AM
Testing a speaker and output transformer Trutone A2-G
morzh Short-circuited turns can be considered as a half-dead transformer. But on this case transformer will hot and s...Vlad95 — 11:01 AM
Testing a speaker and output transformer Trutone A2-G
I am not sure how a transformer could be weak. It could be inadequate, but only when you replace the original with somet...morzh — 09:56 AM

[-]
Who's Online
There are currently 2212 online users. [Complete List]
» 2 Member(s) | 2210 Guest(s)
AvatarAvatar

>