Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

42-350 push-button tuning adjustments
#6

Ok Simple enough. You need to know the frequency of the station you what to set the push button for. For instances 630kc for WMAL, 980kc for WRC, 1150kc for WHMC/WJOK, 1500kc for WTOP, 1580kc for WPGC, and 1600 for WINX ( I don't think they are around any more).

Go to pg 63 of the service manual and at the bottom there is a list of the padders. They are in groups of two. One ant (antenna) and one osc (oscillator). All together there are 10 padders which means there are 5 stations can be set which is how many buttons you have not counting the off/on sw.

The ant tunes the antenna circuit in the the radio and matches it to the frequency of the station. The osc tunes the oscillator stage this selects the station noted within the frequency on the chart. Both padder screws when screwed in will be at the lowest part of the frequency range. Conversely when the screw are almost out it will be at the highest part of the frequency range.

To get the hang of it set the band switch to use the push buttons. Push in the 1st button on the left. If that one is the off/on sw push the one next to it. This button should be the one associated with the 1st two padders. These will adjust the ant and osc frequency.

With the set on and working gently screw in the two padder screws #1&2 then back them out about a 1/4 of a turn. Use screw on padder #2 to tune around a little  and you may hear a strong local station like WMAL @ 630kc. Adjust screw #1 for loudest signal and your all set for WMAL. If all is well button 1 can be set (aligned) for any station between 540-980kc

The tricky part is that both the ant and the osc adjustments tune fairly sharply so it easy to get one out of range of the other. This means that you have to go back and forth a bit to it tuned in to the station you want. Most of us use a signal generator this makes it easier but I'm assuming you don't have one.

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got it!

Terry


Messages In This Thread
RE: 42-350 push-button tuning adjustments - by Radioroslyn - 05-09-2021, 05:48 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
54C Complete Teardown/Rebuild
I don't think that I have encountered a 12Z3 before, curious how it uses one of those but includes a #43, which is a 25 ...Arran — 02:17 PM
HiFi (Chifi) tube amp build - but my own design.
It's the other forum. I'm also in DIY, but mostly read there. Honestly, I kinda jumped into this without much thought to...TV MAN — 10:43 AM
Philco 71 Code 125
Hello,  I am in need of a schematic for this radio. Mine has the three separate circular tube shields and a shadow me...dconant — 08:06 AM
Stromberg Carlson 1500 Squeal
And life just keeps getting more complicated.dconant — 07:57 AM
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM
54C Complete Teardown/Rebuild
The main problem with adding a Bluetooth input is that this set lacks a traditional power transformer to isolate it from...radiorich — 11:19 PM

[-]
Who's Online
There are currently 2309 online users. [Complete List]
» 1 Member(s) | 2308 Guest(s)
Avatar

>