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

Thread Closed

Philco 90 Lowboy
#8

I have been working on the 90 this week, recapping and replacing out of tolerance resistors. This thing has really been hacked, badly!  I have gotten thru the power supply and AF section and speaker. I powered up this evening and after finding a bad detector, got it playing. I am feeling pretty good about that, considering the rewire from all the hacked up previous "repairs" was quite extensive. It will tune in one strong local station right where it should be on the dial. I checked the IF frequency lwith my scope and it appears to be right on 260 kHz. This is the single tube 47 output, and according to Ron's info in the tech section, it should be tuned to 175 kHz. My question is: can it even be tuned to 260 kHz and operate? I am assuming one of the previous repairmen aligned it to 260 in error? I am just wanting to confirm the correct IF before attempting a change. There wouldn't be an odd ball run that is supposed to be tuned to 260, perhaps?

I won't be doing an alignment until i complete the recap on the RF section. Still need to clean up the tuning condenser too. It needs new rubber bushings which won't allow me to tune the full range of the radio.

Thanks for any insites as to what is going on.

Chris H
N9WHH


Messages In This Thread
Philco 90 Lowboy - by Chris h - 08-20-2016, 08:23 PM
RE: Philco 90 Lowboy - by markmokris - 08-22-2016, 10:29 AM
RE: Philco 90 Lowboy - by morzh - 08-22-2016, 11:26 PM
RE: Philco 90 Lowboy - by Chris h - 08-23-2016, 08:19 AM
RE: Philco 90 Lowboy - by Radioroslyn - 08-23-2016, 12:27 PM
RE: Philco 90 Lowboy - by Chris h - 08-23-2016, 01:21 PM
RE: Philco 90 Lowboy - by Chris h - 12-14-2016, 01:13 AM
RE: Philco 90 Lowboy - by Chris h - 12-20-2016, 11:00 PM
RE: Philco 90 Lowboy - by morzh - 12-21-2016, 12:40 AM
RE: Philco 90 Lowboy - by Ron Ramirez - 12-21-2016, 12:59 PM
RE: Philco 90 Lowboy - by morzh - 12-21-2016, 02:12 PM
RE: Philco 90 Lowboy - by Chris h - 12-21-2016, 11:21 PM
RE: Philco 90 Lowboy - by morzh - 12-21-2016, 11:29 PM
RE: Philco 90 Lowboy - by Ron Ramirez - 12-22-2016, 07:05 AM
RE: Philco 90 Lowboy - by Chris h - 12-27-2016, 10:58 AM
RE: Philco 90 Lowboy - by Chris h - 12-31-2016, 01:47 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
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
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

[-]
Who's Online
There are currently 1879 online users. [Complete List]
» 1 Member(s) | 1878 Guest(s)
Avatar

>