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

Philco 89B won't oscillate!
#14

No haven't given up yet. Was on another forum. Ok so if you look at the schematic find the cathode connection on the mixer tube. Follow it over and you will see that it goes over to a coil. That is the feedback winding of the osc coil. The other end of that winding goes to the 15K resistor and 700mmfd cap and then to the chassis. That winding is what is what we need to test the resistance of. There are two other winding on that same coil but those are usually ok. Also check the 15K resistor to see if it is open. Just for grins how much voltage do you have at the cathode of the mixer?? Should be pretty low like a few volts.

Terry


Messages In This Thread
Philco 89B won't oscillate! - by Steve McDonald - 04-13-2016, 02:00 PM
RE: Philco 89B won't oscillate! - by morzh - 04-13-2016, 05:03 PM
RE: Philco 89B won't oscillate! - by Radioroslyn - 04-13-2016, 06:31 PM
RE: Philco 89B won't oscillate! - by Radioroslyn - 04-13-2016, 07:34 PM
RE: Philco 89B won't oscillate! - by Radioroslyn - 04-13-2016, 08:48 PM
RE: Philco 89B won't oscillate! - by Radioroslyn - 04-13-2016, 09:00 PM
RE: Philco 89B won't oscillate! - by Radioroslyn - 04-13-2016, 10:34 PM
RE: Philco 89B won't oscillate! - by Radioroslyn - 04-13-2016, 11:43 PM
RE: Philco 89B won't oscillate! - by morzh - 04-14-2016, 03:13 PM
RE: Philco 89B won't oscillate! - by Radioroslyn - 04-14-2016, 08:10 PM
RE: Philco 89B won't oscillate! - by KCMike - 04-14-2016, 10:30 PM
RE: Philco 89B won't oscillate! - by klondike98 - 05-02-2016, 06:38 PM
RE: Philco 89B won't oscillate! - by klondike98 - 05-06-2016, 03:24 PM
RE: Philco 89B won't oscillate! - by klondike98 - 05-06-2016, 05:53 PM
RE: Philco 89B won't oscillate! - by Radioroslyn - 05-09-2016, 07:51 PM
RE: Philco 89B won't oscillate! - by KCMike - 05-10-2016, 02:13 PM
RE: Philco 89B won't oscillate! - by Radioroslyn - 05-10-2016, 02:34 PM
RE: Philco 89B won't oscillate! - by Radioroslyn - 07-11-2016, 07:57 AM
RE: Philco 89B won't oscillate! - by Radioroslyn - 07-11-2016, 07:09 PM
RE: Philco 89B won't oscillate! - by Radioroslyn - 07-11-2016, 09:28 PM
RE: Philco 89B won't oscillate! - by Radioroslyn - 07-12-2016, 08:18 AM
89B DOES Oscillate!! - by Steve McDonald - 05-02-2016, 05:03 PM
89B DOES Oscillate!! - by Steve McDonald - 05-06-2016, 03:09 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
HiFi (Chifi) tube amp build - but my own design.
Tim - Photos of 8 octal tube sockets. (Top and bottom) Send me a PM if you're interested.RodB — 04:11 PM
VTVM meter moves when my hand is next to it & not on
Haha! I hope so. It seemed rather lost and forgotten languishing in the frozen Northeast of England.EdHolland — 02:36 PM
VTVM meter moves when my hand is next to it & not on
Ed - it's in the Cayman's enjoying the good life.RodB — 02:14 PM
VTVM meter moves when my hand is next to it & not on
Static electricity - but the other chaps beat me to it again. I've seen this before with analogue meters. I've also ...EdHolland — 01:56 PM
Need to purchase some accessories for restoration of my Old Philco Radio
Hi Paulo, Welcome to the Philco Phorum. I can see why you want to find good reproduction parts. That is a bea...MrFixr55 — 11:10 PM
HiFi (Chifi) tube amp build - but my own design.
Tim, I have some bakelite sockets in my work shop that I can dig up. I believe quite a few are NOS. I will take photo...RodB — 10:03 PM
Philco 610B oscillator wiring
> The cathode as noted is wired directly to the ground side of the heater filament for that tube, not to the #17 and ...Radioroslyn — 08:12 PM
HiFi (Chifi) tube amp build - but my own design.
Tim; I noticed your post a little late, but I would take one of the junk sockets and try to break a chunk out of it wi...Arran — 08:07 PM
Need to purchase some accessories for restoration of my Old Philco Radio
Here is a list of resources found in our online library that you might find useful. Mike's Gobs of Knobs email addres...klondike98 — 01:46 PM
First Radio restoration
Hi Tubeman, Welcome to the Philco Phorum.  Phamily Phriendly Pfun with Phine Pholks Phull of Philco Phacts. (See a p...MrFixr55 — 12:33 PM

[-]
Who's Online
There are currently 1701 online users. [Complete List]
» 1 Member(s) | 1700 Guest(s)
Avatar

>