Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12) x

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

Philco 46-480 Electronic Restoration
#15

Today I momentarily shifted gears. I've been researching my options for new AC filter capacitors. When I replaced the big multi-section capacitor on my 49-906, I created a PCB onto which I soldered all of the individual electrolytics necessary to comprise an identical multi-section unit. The nice part was that I matched the shape and the through-holes for rivets.

   

However, the voltage across the capacitors on my 49-906 was a "mere" 115 VDC; for this 46-480, the voltage across the capacitors is 340 VDC. I suddenly realized that the dielectric material of the average PCB may not be rated to withstand these voltages.

Though I am an electrical engineer, I've never commercially designed a PCB. It's always been for personal reasons. So I reached out to OSH Park, who I typically use for producing PCB's. They did indicate that they are able to manufacture a PCB capable of safely handling these voltages. Furthermore, they provided me with some links to tools which will help with trace sizing, temperature increase, etc. I'll have to take my time to dissolve all of this. As usual, I'll share the process and results here.

Joseph

Philco 46-480
Philco 49-906


Messages In This Thread
RE: Philco 46-480 Electronic Restoration - by jrblasde - 01-06-2025, 08:46 PM
462ron - by 462ron - 02-25-2025, 08:24 AM
462ron - by 462ron - 04-09-2025, 07:07 AM
462ron - by 462ron - 04-09-2025, 08:08 AM



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 no members online.

>