1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Other Radios (Non-Philco)

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

Threaded Mode
RCA 1X Alignment
Eric
Senior Member
****
Posts: 451
Threads: 85
Joined: Nov 2011
City: Cumming, GA
#1

06-20-2015, 03:03 PM
I have a RCA 1X Schematic http://www.nostalgiaair.org/pagesbymodel...014806.pdf

I now have it where I need to do an alignment but I have some question on the instructions.
#1 says connect the signal gen to the IF grid through a .01 cap. Are they talking about the 12sk7 pin 4? 
#2 says the same as #1 but to the 1st det. are they talking about 12sa7 pin 8?

and step #4 what do they mean by Radiated signal? Draping the sig gen lead over the ant winding?

Thanks Eric
(This post was last modified: 06-20-2015, 04:13 PM by Eric.)
Find
Radioroslyn
Phorum Expert
*****
Posts: 7,294
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
#2

06-20-2015, 04:08 PM
I would use the pin on (12SA7) to adjust both IF transformers. As for the RF adjustments on the top of the tuning cap One will adjust the frequency(local oscillator) and the other will peak the loop ant.
Set the dial to a local station up at the high end of the dial. Check the dial for the proper frequency. Adjust the osc trimmer to correct if necessary. Adjust the other trimmer for max volume.

Terry
Find
Eric
Senior Member
****
Posts: 451
Threads: 85
Joined: Nov 2011
City: Cumming, GA
#3

06-20-2015, 04:29 PM
(06-20-2015, 04:08 PM)Radioroslyn Wrote:  I would use the pin on (12SA7) to adjust both IF transformers. As for the RF adjustments on the top of the tuning cap One will adjust the frequency(local oscillator) and the other will peak the loop ant.
Set the dial to a local station up at the high end of the dial. Check the dial for the proper frequency. Adjust the osc trimmer to correct if necessary. Adjust the other trimmer for max volume.

Terry

Hi Terry,
Having a hard time picking the pin on the 12sa7 would it be pin 5 or 7?
Find
Radioroslyn
Phorum Expert
*****
Posts: 7,294
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
#4

06-20-2015, 04:38 PM
Well I'd go with pin 8. 7 is the heater,won't work at all. 5 is the control grid for the osc section of the tube. Will work but 8 is better.

Terry
Find
Eric
Senior Member
****
Posts: 451
Threads: 85
Joined: Nov 2011
City: Cumming, GA
#5

06-20-2015, 05:21 PM
(06-20-2015, 04:38 PM)Radioroslyn Wrote:  Well I'd go with pin 8. 7 is the heater,won't work at all. 5 is the control grid for the osc section of the tube. Will work but 8 is better.

Terry


I see it now in the print have it working good still not sure what they mean by radiated signal?
Thanks
Find
Warren
Senior Member
****
Posts: 736
Threads: 26
Joined: Jun 2013
City: Hayward, California
#6

06-20-2015, 06:17 PM
Someone correct me if im wrong but wouldnt a radiated signal be a signal from the generator using an antenna hooked to the signal generator or a lead from the sg?
(This post was last modified: 06-21-2015, 12:46 PM by Warren.)
Find
Radioroslyn
Phorum Expert
*****
Posts: 7,294
Threads: 268
Joined: Dec 2009
City: Roslyn Pa
#7

06-21-2015, 06:46 AM
Yes that would be correct. As I mentioned you can use a local station around 1400-1600kc. Pretty much does the same  thing.

Terry
Find
« Next Oldest | Next Newest »
Thread Closed




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.

>
  1. The PHILCO Phorum
  2. Various and Sundry Categories
  3. Other Radios (Non-Philco)