1. The PHILCO Phorum
  2. Philco Radio Discussions
  3. Philco Electronic Restoration
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: 1,874
Threads: 212
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: 15,819
Threads: 554
Joined: Oct 2011
City: Jackson, 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: 7,285
Threads: 268
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 »




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
trying to identify this wire type
Here's one source for your wire of many. Take care and BE HEALTHY! Gary P.S. Can't get the right color you need? I ...GarySP — 06:40 PM
trying to identify this wire type
...and modern wire of the appropriate gauges and insulation V-rating (300V minimum, usually shown right on the wire) is ...morzh — 05:47 PM
1930s Stromberg-Carlson Tombstone Radio need help identifying model number
I have a question about this radio, is there anyone that has access to this radio that has an intact unmolested speaker ...captainclock1988 — 04:28 PM
1930s Stromberg-Carlson Tombstone Radio need help identifying model number
Well what makes me confuse all of those companies is that all three of those companies (Setchell-Carlson, Stromberg-Carl...captainclock1988 — 04:21 PM
trying to identify this wire type
The red wire is rubber covered wire. The others are cotton braid over rubber often in colors or a tracer, also strand...Chas — 02:43 PM
trying to identify this wire type
Greetings Phorum members, Hope you can help me identify this type of wire in the photo I have attached.  I am not sure ...georgetownjohn — 01:53 PM
Philco 60 Squealing
All correct shields must be in place, all tubes correct no subs of any kind. Check any soldered, riveted ground conne...Chas — 01:24 PM
Philco 60 Squealing
I have recapped and replaced out of tolerance resistors and so on. Radio plays nicely on fairly strong stations. The pro...dconant — 10:55 AM
Philco 46-420 Code 121 Reception issues
Welcome Eric, I agree with Bob and far as the two main electrolytic filter capacitors did you change them yourself or w...radiorich — 11:43 PM
Philco 46-420 Code 121 Reception issues
You mentioned the Philco manual and going through the check points...just to be sure we're on the same page here's the m...klondike98 — 08:13 PM

[-]
Who's Online
There are currently 5116 online users. [Complete List]
» 3 Member(s) | 5113 Guest(s)
AvatarAvatarAvatar

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