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

Linear Mode
model 625 tone control problem
Guest
Unregistered
 
#3

08-21-2007, 01:26 PM
I checked the volume control case with my continuity checker between it and chassis ground and it shows continuity. And the tone control is showing a ground between its case and the chassis as well.
One of the electrolytics is grounded to the chassis. The 16 mfd. can originally was grounded and the replacement I used I connected the same way with a screw tapped into the bottom of the can to hold the negative lead. The other 8 & 8 mfd. can is isolated from the chassis with cardboard insulator and a wire connects the negative to a .25 mfd. capacitor and wirewound resistor which then travels to ground.
Just explaining what I did, so I don't have to later.

Now I am wondering what I should check to resolve this.

Thanks,
David
« Next Oldest | Next Newest »
Thread Closed


Messages In This Thread
model 625 tone control problem - by Guest - 08-20-2007, 11:46 AM
[No subject] - by Ron Ramirez - 08-20-2007, 05:33 PM
[No subject] - by Guest - 08-21-2007, 01:26 PM
[No subject] - by Texasrocker - 08-21-2007, 09:13 PM
[No subject] - by radiomikee - 08-22-2007, 10:06 AM
[No subject] - by davemc - 10-01-2007, 08:32 AM



Users browsing this thread:
[-]
Recent Posts
Philco 42-345 Restoration/Repair
Hi OSanders, Look carefully at the band switch. Turn it slowly and "wiggle" it around the desired band. ...MrFixr55 — 12:33 AM
5U4 vs 5Z4 tubes
I think that RCA and GE introduced metal tubes in the USA in 1936.  I don't know if they were being made by RCA, GE or b...MrFixr55 — 11:20 PM
Philco 42-345 Restoration/Repair
Vlad95, Thank you for the stringing guides and wow there are so manyosanders0311 — 06:01 PM
5U4 vs 5Z4 tubes
A pre war Hallicrafters, and an early one too, very nice! 1936 is pretty early for metal tubes too, which would explain ...Arran — 05:58 PM
Philco 42-345 Restoration/Repair
Thanks Rod, "When you hear the background hiss and no station it usually indicates that the oscillator quit" ...osanders0311 — 05:52 PM
Philco 42-345 Restoration/Repair
RodB :beerchug:Vlad95 — 10:22 AM
Philco 42-345 Restoration/Repair
Vlad, you nailed it. Swiss and German roots.RodB — 09:54 AM
5U4 vs 5Z4 tubes
Well this is a Hallicrafters SX/9 circa 1936. No real issues so far although I dodged a real bullet with a cap that was...bridkarl — 07:59 AM
5U4 vs 5Z4 tubes
The pinout is the same but the 5U4 has a 3 amp filament, verses 2 amps or less on the 5Z4. I think that the pinout of a ...Arran — 12:04 AM
Philco 42-345 Restoration/Repair
By the way. osanders0311 Take a look here: Dial cord stringing Guides May be here you can fount correct string settin...Vlad95 — 11:15 PM

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

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