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 40-201 Restoration Journal
#15

OK. Here's the story. I've missed something really obvious. I replace components one at at time unless there's a gang. I had a resistor out of place. There's a voltage divider coming out of the second IF coil assembly that the volume control taps into through a capacitor. I didn't connect the 330k resistor to ground Icon_eek . When that's done, all I get is the normal squeal and much clearer reception. I think I'm almost home or at least close enough to focus on the cabinet hardware.

I've checked my connections several times. Now I see the error. I think I'll take this as an opportunity to see what's normal with my scope and run through the diagnostics with my signal generator. It time to keep learning and be less concerned about restoration Icon_smile .


Messages In This Thread
Philco 40-201 Restoration Journal - by g8wayg8r - 05-14-2009, 12:41 AM
Re: Philco 40-201 Restoration Journal - by g8wayg8r - 05-25-2009, 01:22 PM



Users browsing this thread:
[-]
Recent Posts
Part numbers to model cross
That I wouldn't know, but sometimes the radio document itself shows one, same as the capacitor cans' etc pinouts.morzh — 12:46 PM
Part numbers to model cross
Thank you morzh, that is exactly what I was looking for. Now , is there some where that shows pinouts for Philco power ...Jim Dutridge — 11:37 AM
Restoration of the Canadian General Electric A-87
Thanks for your help Michael. In fact, this video is only an intermediate result. Later I had to apply another tinting l...RadioSvit — 09:01 AM
Restoration of the Canadian General Electric A-87
Great job on the cabinet. PS. In the US notation, "kenotron" refers to specific type of tubes; we call re...morzh — 08:24 AM
Part numbers to model cross
This document has at least some tables of models and parts used. Example: Choke 32-7572, used in 604 radio. Search f...morzh — 08:19 AM
Restoration of the Canadian General Electric A-87
I also checked all the radio tubes on my Hickok 530 tube tester. The 5Z3 kenotron turned out to be faulty, all the other...RadioSvit — 08:02 AM
Restoration of the Canadian General Electric A-87
Well... While the varnish is drying up, I started repairing the chassis... Of course I started by replacing the pa...RadioSvit — 07:12 AM
Philco Model 38-7: what caps & resistors do fail typically?
Hello Martin, Welcome aboard our little community what great Model 38-7 Sincerely Richardradiorich — 12:30 AM
Philco Model 38-7: what caps & resistors do fail typically?
Welcome to the Phorum Martin. I count about 9 paper caps, the 3 electrolytic caps and 2-Y2 safety caps to replace th...RodB — 09:44 PM
Part numbers to model cross
Jim, We have this index put together by Dale Cook but I don't think that is quite what you are looking for. The Parts...klondike98 — 09:37 PM

[-]
Who's Online
There are currently 1437 online users. [Complete List]
» 2 Member(s) | 1435 Guest(s)
AvatarAvatar

>