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: 3 Guest(s)
[-]
Recent Posts
1949 Motorola 5A9M
LOL!! Well Arran, if you do dive into it and come across any advice on dealing with accessing components let me know. I...klondike98 — 11:56 PM
1949 Motorola 5A9M
Bob and Gary; I have the further complication on the Phillips that they decided to use some 200 volt rated paper caps...Arran — 10:05 PM
1949 Motorola 5A9M
Thx Arran & Gary. Yes its super crowded in the chassis and I've debated whether to try to restuff caps or not. I t...klondike98 — 07:40 PM
1949 Motorola 5A9M
That's got to be one of the tightest conglomeration of components I've ever seen! I wonder how the line workers felt bu...GarySP — 05:46 PM
1949 Motorola 5A9M
Bob; I think that the Phillips was actually manufactured in Canada, though they may have imported many of the compone...Arran — 02:28 PM
1949 Motorola 5A9M
I've started replacing the electrolytic caps now. As Arran mentioned, they are housed under a metal strap. Here's a ph...klondike98 — 12:22 PM
1949 Motorola 5A9M
Thank for that info Arran! Very interesting. Phillips and Motorola must have made some type of marketing deal back then....klondike98 — 11:49 AM
46-1213 Schematic Question
Good idea on the fuse. These old transformers need extra protection.RodB — 10:02 AM
46-1213 Schematic Question
Hello Larry, Well, anyway I can contest about noisey grounds in my living room when I am using one outlet in my house a...radiorich — 08:03 AM
46-1213 Schematic Question
RodB & MrFixr55, Thank you both for the great replies at my questions, I appreciate the help very much.  As suggest...MissouriLarry — 07:04 AM

[-]
Who's Online
There are currently no members online.

>