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 42-380X Reception problems
#19

Dave,

First, I think I misinformed you that compensators 4 through 4E don't effect sensitivity. 4A and 4B definitely do, as they help tune the resonant frequency of the antenna you are using. (I edited my post above.) I would advise to adjust those compensators with the radio connected to the built-in loop, and follow the alignment instructions in whatever service information you have. If you have the Rider pages from Nostalgia Air, use the table and the notes just under the parts list.

Once you correctly adjust the IF compensators 29 through 34, you shouldn't need to touch them again unless you change out a component that changes their resonant frequency.

Steps 5 and 6 of the table in the Rider's alignment instructions show how to use the signal generator for the short wave bands. The alignment chapter in Elements shows how to make a loop of wire to use instead of connecting the signal generator to the antenna lead as you do when adjusting the IF cans. Other than that the only change in the operation of the signal generator is to change the frequency. Once you get a feel for the signal generator, go through these steps in order. If after following these steps sensitivity is an issue, more in-depth troubleshooting is needed.

I can't stress enough how helpful the Philco service packages are that you can get from Chuck Schwark. They are clear and easy to read, and usually more complete than the free ones on Nostalgia Air.

John Honeycutt


Messages In This Thread
Philco 42-380X Reception problems - by David B - 09-14-2008, 09:51 AM
Re: Philco 42-380X Reception problems - by Raleigh - 09-27-2008, 05:09 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
An attempt to remove the Field Coil from a G speaker
Mike; I've only run into a speaker with an open filed coil twice, and they were on newer speakers from the 1940s. One ...Arran — 12:48 AM
An attempt to remove the Field Coil from a G speaker
Arran Yes, this is my plan for now and what do I got to lose, this is not even the speaker from this radio, but one o...morzh — 10:44 PM
An attempt to remove the Field Coil from a G speaker
Mike;  I would unwrap the field coil, and see if maybe there a break near one of the ends, like where the coil wire att...Arran — 10:23 PM
An attempt to remove the Field Coil from a G speaker
...and this is what I did. I fed a little LT into the screwholes with a small brush, and a little on the rim next to the...morzh — 09:52 PM
Philco 40-120C Restoration
I combined the two 40-120C threads together as we like to keep the discussion of the same radio together. It helps with...klondike98 — 09:36 PM
Philco 40-120C Weak, Distorted Ouput
Just checked were I buy tubes price is four dollars. So living in Florid we have a local source for tubes. David    David — 09:14 PM
Philco 40-120C Weak, Distorted Ouput
The higher voltage may be due to higher mains voltage. My mains run 120-125AC when the set was new mains would be 110-11...David — 09:09 PM
Philco 40-120C Weak, Distorted Ouput
Thank you for your reply. I pulled a speaker from a Philco 41-221 and received the same result. I used a signal tracer t...bluecap — 08:45 PM
Philco 40-120C Weak, Distorted Ouput
Have you tried a different speaker? How did you trace the distortion? How do you know it is weak? What is the reference?...morzh — 08:33 PM
Philco 46-480 Electronic Restoration
Amen to that! Every time I think I’ve captured them all, I realize that there’s another error. My goal is to finish with...jrblasde — 07:00 PM

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

>