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

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

Philco Shadowgraph meter, the old style, coil removal
#17

Well, it has just come back.
The resistance is 1.1K, don't know how many turns but supposedly they went by repair manuals, and I also pointed them to that article at Philcorepairbench. They at some point mentioned #41 wire and not #40, I will have to ask them what wire they ended up using.

I took a guess about the polarity as they used two white wires to make the leads. I guessed it right as the shadow seems to narrow when I tune in.

Not everything is working like it should, and I have to check a few things.

One is, if they used #41 wire and not #40 then it takes less turns to achieve 1.1K, but what really matters is that number of turns as this is what creates the field, so with less turns it may be weaker.
Then again, I think the current icreases when it is "Off-tune" so the stronger current widens the shadow, not narrows it, so I may be OK and it is the Off-tune width that would suffer. And it is acceptable.

When the radio starts though, the shadow goes to the most narrow. Don't know whether that is an indicator or not.

I guiess I will have to re-read the procedure at Philcorepairbench.

I will have to ask experts in the Philco documentaion a couple of questions in my Philco 18 thread.


Messages In This Thread
RE: Philco Shadowgraph meter, the old style, coil removal - by morzh - 03-29-2013, 11:31 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
1949 Motorola 5A9M
bob  Nice work on battery . If you don't. Have terminals i have a few spares  Samsam — 02:12 AM
1949 Motorola 5A9M
hello mr Fixr, for sure !! I have some radios that I need to make some batteries for too. Sincerely richardradiorich — 12:33 AM
1949 Motorola 5A9M
Dittos, sweet b on the battery. Love the "9 Lives" logo, remembered from my childhood. Other neat ones are t...MrFixr55 — 11:24 PM
Philco 46-1209 strange behavior
Hi Morzh, Dunno if the AC EMI caps are an issue. I never liked the concept but never had an issue with these causin...MrFixr55 — 11:21 PM
Philco 46-1209 strange behavior
And no hum without the 7AF7? Not common but I am thinking heater - cathode short. This would introduce hum in this sta...MrFixr55 — 11:14 PM
schematics
Those filter caps in the cardboard tube are easy to restuff, especially the kind with the rolled over end. You don't hav...Arran — 09:56 PM
Philco Model 16 wiring question
If you have 5 wires, do this: The wires that go to thick-wire wound winding are the filament. If you do not know wha...morzh — 09:03 PM
Philco Model 16 wiring question
I recently acquired a Philco Model 16 Code 126. I removed the power transformer to place heat shrink on some very bad...bobclausen — 08:23 PM
1949 Motorola 5A9M
Hello Bob, That battery looks great nice job ! Sincerely Richardradiorich — 08:20 PM
1949 Motorola 5A9M
Yes, I plan to put a Velcro closer on the top.klondike98 — 07:28 PM

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

>