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

Thread Closed

Model 90 1st RF question
#5

Thanks for the feedback. I've learned through recent experience that a coil that shows continuity on an ohmmeter does not necessarily mean it's good. I had a similar problem with my recently completed 48-482: OK reception on the AM band, but not nearly as good as a radio with 3 IF amplifiers should have, so I tested everything again, and every one came up solid. My only clue was that when adjusting the IF padders during alignment, the 2nd primary made no difference no matter how tight or loose I adjusted it. Luckily, John Kendall had just the replacement can I needed, so when it arrived, I swapped it in immediately and voila! Sweet, strong reception all up and down the band, even though the original tested fine.

So I'm very anxious to test the improvised RF primary, as well as running through all the voltage tests on that stage, this weekend. Results to follow...


Messages In This Thread
Model 90 1st RF question - by mgutierres - 03-18-2011, 12:26 PM
RE: Model 90 1st RF question - by brett2752 - 01-28-2024, 04:27 PM
RE: Model 90 1st RF question - by Chas - 01-28-2024, 06:51 PM
Re: Model 90 1st RF question - by Ron Ramirez - 03-18-2011, 01:36 PM
Re: Model 90 1st RF question - by 7estatdef - 03-18-2011, 06:18 PM
Re: Model 90 1st RF question - by Steve Davis - 03-19-2011, 07:08 PM
Re: Model 90 1st RF question - by mgutierres - 03-23-2011, 10:01 PM
Re: Model 90 1st RF question - by 7estatdef - 03-24-2011, 02:10 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
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
54C Cabinet Refinish
I started stripping this cabinet before it got super chilly out because I knew I wasn't going to be able to work on ...glyphmon — 11:18 PM
54C Complete Teardown/Rebuild
While I'm waiting to wrap up the final steps on my wife's Silvertone 2014, I started disassembly on the next project.  O...glyphmon — 11:07 PM

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

>