Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

Philco 90 Oscillator question
#2

Hi Mark,
I think the general consensus is that original was 38g but I don't think that gauge is real important within reason. Direction is, wind it the wrong way around and it won't oscillate. Not enough turns will stop it from working, if you are close to the number of turns it may work but won't tune the whole range of frequencies. Will dropout at the low end of the band. Some will bake the coil at low temp to evaporate any moisture in the form. Water can drastically lower the Q of the coil (efficiency).
If you are sure you are winding in the proper direction then try adding a few more turns (like 3-4) and see if that snaps it back into operation. You can take a listen for it with another set tuned to the same frequency + the IF frequency.

GL
Terry


Messages In This Thread
Philco 90 Oscillator question - by bdi1976 - 03-07-2016, 10:00 PM
RE: Philco 90 Oscillator question - by Radioroslyn - 03-08-2016, 07:32 AM
RE: Philco 90 Oscillator question - by TV MAN - 03-10-2016, 10:31 AM
RE: Philco 90 Oscillator question - by bdi1976 - 03-11-2016, 09:54 PM
RE: Philco 90 Oscillator question - by bdi1976 - 02-18-2017, 01:51 PM
RE: Philco 90 Oscillator question - by bdi1976 - 02-18-2017, 07:00 PM
RE: Philco 90 Oscillator question - by bdi1976 - 02-19-2017, 12:35 PM
RE: Philco 90 Oscillator question - by bdi1976 - 02-20-2017, 10:03 PM
RE: Philco 90 Oscillator question - by sam - 02-21-2017, 12:42 PM
RE: Philco 90 Oscillator question - by bdi1976 - 02-21-2017, 05:24 PM
RE: Philco 90 Oscillator question - by bdi1976 - 02-24-2017, 10:38 PM
RE: Philco 90 Oscillator question - by bdi1976 - 03-12-2017, 05:11 PM
RE: Philco 90 Oscillator question - by bdi1976 - 03-12-2017, 07:54 PM



Users browsing this thread: 4 Guest(s)
[-]
Recent Posts
HiFi (Chifi) tube amp build - but my own design.
Tim, nice write up and thanks for sharing !! Sincerely Richardradiorich — 02:47 AM
HiFi (Chifi) tube amp build - but my own design.
Well, this was a real "Hum-Dinger" :lol: ! This will be kinda long, but hopefully it will help others having t...TV MAN — 01:55 AM
Shadow Meter Bulb
Phorum members, I am trying to find the bulb # for PHILCO Shadow Meter part number 45-2180 that is from a 37-640 chassis...georgetownjohn — 06:53 PM
Philco 41-608 changer coupler
3D-printing...short of machining, of course. Or molding.morzh — 05:20 PM
Philco 41-608 changer coupler
Thanks, Morzh. That solves the issue of the rubber pieces. Now, I need to find a way to replicate the pot metal piec...alangard — 05:07 PM
12' Philco
If it is 12', either Kareem or Andre would have to jump pretty high to look at the front panel. Kareem would have an e...morzh — 01:48 PM
12' Philco
And here's a story about the tires on the truck. Same "no-stoop" guy must have installed these! Take care a...GarySP — 01:17 PM
Hickok AC51 tube tester
I think they have only shown the secondaries of the transformer. Two of them feed the rectifiers' filaments.morzh — 12:58 PM
IF can wire size and Rubber mounts?
Arran If the wire inside cans is the gauges you mentioned, the sole reason for that would be mechanical, to stiffen t...morzh — 12:56 PM
12' Philco
Rod, Yes, I know, but the Giant Philco is not around anymore either, so I go by whoever was alive fairly recently. H...morzh — 12:54 PM

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

>