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

Thread Closed

Philco 71 restoration
#14

Finally got to the power up point yesterday. I brought it up on my variac with no tubes no issues, then popped in the 80 tube and brought it up to around 115vac in, no issues 80 plates had about 700v on them, 5v on the filiments and I didnt check for DC. So I shutdown and tried again with all the tubes then it happened. I smelled something getting hot and saw a couple wisps of smoke at around 100vac in. I shut down in a hurry and felt around and found a resistor in the power supply getting hot (~140 deg). It's the 10k .5w resistor (#54, arrow in pic below). Not sure whats up yet I had to stop playing in radio land after I found this hopefully tonight I can take another look at it. The resistor I am using for #54 is a 10k 2w.

[Image: http://i1129.photobucket.com/albums/m501...erheat.jpg]

Also can someone tell me if the circled part of the pic is connected or just crossing over each other? I have them connected which might be causing the problem? Icon_problem

I also changed the title to for the thread to something more fitting..

-Keith


Messages In This Thread
Philco 71 restoration - by Keith - 09-29-2011, 12:48 AM
RE: Philco 71 restoration - by Keith - 03-02-2012, 06:09 PM
Re: Man this thing is a nightmare - by Keith - 09-29-2011, 01:36 AM
Re: Man this thing is a nightmare - by Keith - 09-29-2011, 10:14 PM
Re: Man this thing is a nightmare - by Keith - 10-06-2011, 12:29 AM
Re: Man this thing is a nightmare - by Arran - 10-06-2011, 02:24 AM
Re: Man this thing is a nightmare - by rghines1 - 10-06-2011, 10:20 AM
Re: Man this thing is a nightmare - by exray - 10-06-2011, 12:41 PM
Re: Man this thing is a nightmare - by Keith - 10-08-2011, 10:34 PM
Re: Man this thing is a nightmare - by Marsupial - 10-08-2011, 11:52 PM
Re: Man this thing is a nightmare - by exray - 10-09-2011, 05:56 AM
Re: Man this thing is a nightmare - by Keith - 10-10-2011, 01:40 PM
Re: Philco 71 restoration - by Keith - 10-31-2011, 05:10 PM
Re: Philco 71 restoration - by 7estatdef - 10-31-2011, 08:48 PM
Re: Philco 71 restoration - by 7estatdef - 10-31-2011, 09:00 PM
Re: Philco 71 restoration - by Keith - 11-01-2011, 01:03 AM
Re: Philco 71 restoration - by Keith - 11-01-2011, 01:06 AM
Re: Philco 71 restoration - by 7estatdef - 11-01-2011, 10:58 PM
Re: Philco 71 restoration - by Keith - 11-03-2011, 01:03 AM
Re: Philco 71 restoration - by 7estatdef - 11-03-2011, 02:59 AM
Re: Philco 71 restoration - by codefox1 - 11-03-2011, 10:04 AM
Re: Philco 71 restoration - by Keith - 11-03-2011, 06:00 PM
Re: Philco 71 restoration - by 7estatdef - 11-03-2011, 06:26 PM
Re: Philco 71 restoration - by Keith - 11-03-2011, 06:31 PM
Re: Philco 71 restoration - by 7estatdef - 11-03-2011, 06:42 PM
Re: Philco 71 restoration - by Keith - 11-03-2011, 07:40 PM
Re: Philco 71 restoration - by 7estatdef - 11-03-2011, 08:39 PM
Re: Philco 71 restoration - by Keith - 11-03-2011, 09:38 PM
Re: Philco 71 restoration - by Keith - 11-04-2011, 12:29 AM
Re: Philco 71 restoration - by Keith - 11-04-2011, 02:33 PM
Re: Philco 71 restoration - by Keith - 11-30-2011, 11:56 PM
Re: Philco 71 restoration - by TA Forbes - 12-01-2011, 12:37 AM
Re: Philco 71 restoration - by TA Forbes - 12-02-2011, 09:54 PM
Re: Philco 71 restoration - by codefox1 - 12-03-2011, 11:48 AM
Re: Philco 71 restoration - by Keith - 12-04-2011, 03:03 PM
Re: Philco 71 restoration - by Keith - 12-23-2011, 04:36 AM



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 3697 online users. [Complete List]
» 1 Member(s) | 3696 Guest(s)
Avatar

>