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

Thread Closed

Alignment Issues for Philco 70
#4

Here's where the rubber meets the road. You already know your connection points.
1 Tune the IF cans for maximum sound via the speaker with a off the air signal.
2 Tune the Front end Ant RF adjustment around 1600 for maximun sound at the speaker with an off the air signal.
3 Go back and put a meter on the speaker, if you wish, and tune your signal generator to 260 kc and using the minimum acceptable signal, touch up the IF cans. At this point your not concerned about what frequency the dial shows on the generator, You know the radio's right. The IF cans dont change the radios recieve frequency. When we adjust their "resonance" we are just allowing them to pass through the desired passband at the maximum amplitude possible to the next stage.
4 Tune for max on the Ant RF adjustment as well.
5 Use the Signal generator to set the oscilator tuning and osc trimmer at the radio (1600 and 600 kc). Use the generator to find what the radio is set for, not the other way around. When finished use off the air station signals to correctly calibrate the osc adjustment and trimmer.
6 Touch up the Ant RF again at the high end of the dial.
7 Do this for each additional band for the radio, but leave the IF's alone after this first run through.

Remember to always use the minimum acceptable signal from the generator (not the radio's volume control) as too much will overload the front end of the radio and make finding that sweet spot a lot harder to discern during your alignment.

Now, sit back and enjoy your radio.

Dave Casazza
Keep em glowin and goin...


Messages In This Thread
Alignment Issues for Philco 70 - by Guest - 12-06-2008, 10:34 PM
Re: Alignment Issues for Philco 70 - by etech - 12-06-2008, 11:23 PM
Re: Alignment Issues for Philco 70 - by DCASAZZA - 12-07-2008, 07:14 AM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco P45-6365 Universal Transformer Instruction Manual
Can anyone guide me to where this may be found?GRG — 03:00 PM
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

[-]
Who's Online
There are currently 1630 online users. [Complete List]
» 1 Member(s) | 1629 Guest(s)
Avatar

>