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

Shadow meter question
#1

Hi,

I have a Philco 37-670 with an inoperative shadow meter (the newer style). Not familiar with this meter; it's the first time I've dealt with one. Pretty cool! Anyway, here is what I know and have done so far. Any suggestions?

1. The meter coil is good. It measures out to about 1,450 ohms.
2. I removed the magnet from the coil assembly. I've read that they lose their magnetism. I tried to remagnetize it with a neodymium magnet and think I succeeded; it's now magnetized enough to pick up a small paper clip.
3. I reinstalled the magnet, etc. The shutter that swings back and forth is in good condition, moves freely.
4. With the radio on, I am getting about 215 volts on either side of the shadow meter coil. The voltage doesn't change much (a few volts) when I tune in and out of a strong station. The vane moves a touch, but barely enough to make much difference in the width of the shadow.

Any suggestions on what to try? Should I be seeing a greater variance in voltage in/out of stations? 

Thanks! Here's the schematic:

http://imgur.com/NozIIBg


Messages In This Thread
Shadow meter question - by Diverted - 02-04-2015, 11:56 AM
RE: Shadow meter question - by klondike98 - 02-04-2015, 12:02 PM
RE: Shadow meter question - by Steve Davis - 02-04-2015, 12:22 PM
RE: Shadow meter question - by Diverted - 02-04-2015, 12:46 PM
RE: Shadow meter question - by Diverted - 02-04-2015, 04:28 PM
RE: Shadow meter question - by codefox1 - 02-04-2015, 05:22 PM
RE: Shadow meter question - by klondike98 - 02-04-2015, 07:04 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 610B oscillator wiring
Still not clear on the wiring interface between the 6A7 and oscillator. After refering to the available schematics and s...Tubester — 07:18 PM
Refinishing Ideas
My 37-116 code 121 is the best sounding radio i have...a daily driver. Since we are talking about "changes". ...poulsbobill — 07:18 PM
My Philco 37-116 Restore
Hello, I finally got brave enough to take the cans off the Expander Unit. Got the grid cap wires replaced and back toget...dconant — 06:50 PM
Zenith H725
I got into the first AM IF can today, and found its mica was cracked. Amazing that it was still working. This one makes ...EdHolland — 06:10 PM
Philco model #20
AHH HA , I got it and can’t thank you fellows enough , when I changed the capacitors I took the advice and did not unsol...onlyrick — 02:24 PM
Zenith H725
Hello Ed, yes, I like letting projects run for few days to make sure they don't start acting up . Sincerely Richardradiorich — 01:03 PM
Philco 46-480 Electronic Restoration
I am almost finished with this restoration. All which remains is the power transformer. I cleaned it up some time ago, b...jrblasde — 12:41 PM
Philco model #20
I seem to recall in some TRF sets there being a Local/Distance toggle switch that removes the B+ from the first 24 rf tu...RodB — 09:46 AM
Refinishing Ideas
Hi Doppelganger, After rereading your thread, did you mount the Zenith speakers in the two bottom left and right pos...MrFixr55 — 09:39 AM
Philco model #20
Hi Rick, One other thing regarding volume on this set.  Make sure that the tube shield is in place.  this is that la...MrFixr55 — 08:22 AM

[-]
Who's Online
There are currently 1693 online users. [Complete List]
» 2 Member(s) | 1691 Guest(s)
AvatarAvatar

>