Oscillator Circuit

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

Oscillator Circuit

marty
Member

Posts: 240
Threads: 27
Joined: Jun 2013
City: Boulder, Colorado

08-23-2013, 08:18 PM

Hi All;
I have wired up the Oscillator circuit, according to the schematic I have for the Philco 39, It does one of the things that my Radio does.. It overheats the 5K resistor, that is between the Plate and the 2nd Grid.. The voltages are suppossed to be on the Plate +136Volts, which it has correctly.. On the 2nd Grid it is suppossed to have +120Volts and it has arround +50volts.. Grid 4 (tube cap) is --3 which is correct.. Grids 3 and 5 have +67Volts which is correct..
Am I Missing something as to "WHY" The 2nd Grid is being pulled so Low, also attached to the 2nd Grid is one side of the Coil, and the other side of the coil goes to a Capacitor, so there would be NO DC flow there, which ends up going to ground thru a 51K resistor..
THANK YOU Marty

Find

« Next Oldest | Next Newest »

Thread Closed

Messages In This Thread

Oscillator Circuit - by marty - 08-22-2013, 04:59 PM

RE: Oscillator Circuit - by BrendaAnnD - 08-22-2013, 06:22 PM

RE: Oscillator Circuit - by marty - 08-22-2013, 11:11 PM

RE: Oscillator Circuit - by morzh - 08-23-2013, 10:34 AM

RE: Oscillator Circuit - by marty - 08-23-2013, 08:18 PM

RE: Oscillator Circuit - by Mondial - 08-23-2013, 08:46 PM

RE: Oscillator Circuit - by morzh - 08-23-2013, 09:24 PM

RE: Oscillator Circuit - by marty - 08-23-2013, 10:19 PM

RE: Oscillator Circuit - by marty - 08-23-2013, 11:01 PM

RE: Oscillator Circuit - by morzh - 08-23-2013, 11:47 PM

RE: Oscillator Circuit - by marty - 08-24-2013, 12:22 AM

RE: Oscillator Circuit - by BrendaAnnD - 08-24-2013, 01:31 AM

RE: Oscillator Circuit - by marty - 08-24-2013, 10:50 AM

RE: Oscillator Circuit - by morzh - 08-24-2013, 11:52 AM

RE: Oscillator Circuit - by marty - 08-24-2013, 05:01 PM

View a Printable Version

Users browsing this thread: 1 Guest(s)

Recent Posts
PT 6 chassis screws size???
Have this done except for missing chassis screws. It looks like 1 inch 6/32 sheet metal screw may work but can anyone s...bridkarl — 10:32 PM
Philco model 38 code 121 not receiving signal.
Hello Stormlord, Well done on rewinding that coil it turned fairly good for your first one. Sincerely Richardradiorich — 09:12 PM
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

Who's Online

There are currently 975 online users. [Complete List]
» 2 Member(s) | 973 Guest(s)

Login
Username:
Password:	Lost Password?
	Remember me