1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration

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

Threaded Mode
Philco 680 Shadograph.
vaguy22
Junior Member
**
Posts: 41
Threads: 12
Joined: Nov 2012
City: Suffolk, VA
#1

02-02-2018, 10:50 PM
Has anyone fixed a Model 680  shadowgraph. I tried the usual hints from the " repair bench" with no results. the vane is free and coil shows 500 ohms resistance. #85 tube is good with 70 volts plate voltage. Thanks in advance   Norman
Find
Nathan Slingerland
Super Moderator
******
Posts: 1,889
Threads: 214
Joined: May 2015
City: Seattle State, Province, Country: WA
#2

02-02-2018, 10:56 PM
Any chance that the bar magnet has become demagnetized?

500 ohms sounds low to me for the coil resistance - typically they're >1K.
Find
morzh
Odobenus rosmarus
******
Posts: 16,507
Threads: 572
Joined: Oct 2011
City: Jackson State, Province, Country: NJ
#3

02-02-2018, 11:14 PM
Even if 500 ohm, still should react.
I second the magnet thought.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Find
Radioroslyn
Phorum Expert
*****
Posts: 7,301
Threads: 269
Joined: Dec 2009
City: Roslyn Pa
#4

02-03-2018, 10:08 AM
Just for grins take a 9v battery - to the chassis and + to the grid cap of the 85. Should cause the vane to deflect.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
Find
vaguy22
Junior Member
**
Posts: 41
Threads: 12
Joined: Nov 2012
City: Suffolk, VA
#5

02-06-2018, 10:26 PM
Thank you folks for the hints. Norman
Find
« Next Oldest | Next Newest »
Thread Closed




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco model 38 code 121 not receiving signal.
Well here it is. It ain't pretty, but hopefully it'll work. I checked it with my DMM on continuity and it keeps and r...Stormlord5500 — 08:56 PM
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

[-]
Who's Online
There are currently 513 online users. [Complete List]
» 3 Member(s) | 510 Guest(s)
AvatarAvatarAvatar

>
  1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration