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 filament section on PT bad
#16

Well here is what I have set up, the transformer is out of the radio, the tubes are on my bench and wired only to the transformer.  I set it up this way to make sure nothing in the chassis was shorting out.     The only thing I can think at this point is a weak transformer.  The primary is drawing only about .3 amps at 115vac.  The tubes out of the chassis and in the chassis measure the same.  About 1.8vac with about 7 to 8 amps.  I am leaning to something in the transformer.  When I took it apart earlier, I noticed where one of the filament leads attached, there was some charred wrapping.  I will take it apart again tomorrow and inspect it closer.  Just a couple of pictures to show what I have been up to.

   
   
   


Messages In This Thread
Philco 90 filament section on PT bad - by Skip - 04-02-2016, 02:08 PM
RE: Philco 90 filament section on PT bad - by Skip - 04-03-2016, 12:45 AM
RE: Philco 90 filament section on PT bad - by OZ4 - 04-03-2016, 12:02 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
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
Preliminary work on wife's Silvertone 2014
Hello roy, that great news glad it worked out for you !! Sincerely Richardradiorich — 10:50 PM
Preliminary work on wife's Silvertone 2014
Safety caps arrived today.  Soldered one in and had a successful first power-up.  No magic smoke escaped and it tunes in...glyphmon — 09:53 PM

[-]
Who's Online
There are currently 1785 online users. [Complete List]
» 1 Member(s) | 1784 Guest(s)
Avatar

>