38-15 Project

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

Thread Closed

Thread Rating:

0 Vote(s) - 0 Average
1
2
3
4
5

Linear Mode

38-15 Project

ipwizard
Senior Member

Posts: 335
Threads: 50
Joined: Apr 2011
City: Apple Creek State, Province, Country: Ohio

08-10-2012, 01:25 PM

Just started on a Philco 38-15 a couple weeks ago. Got all the caps replaced along with all of the out of tolerance resistors. It comes up and plays but there is a bad 60hz hum coming coming out of the speaker. I used my signal tracer and traced back through the circuit and I don't pick it up in the 6A7, but I do pick it up on the 78 tube. I haven't been able to track down where that hum is getting into the audio from.

If anyone had any ideas let me know.

I have double checked that the E-caps are connected correctly.

Schematic here:
http://www.nostalgiaair.org/PagesByModel...013239.pdf

-Keith

Find

« Next Oldest | Next Newest »

Thread Closed

Messages In This Thread

38-15 Project - by ipwizard - 08-10-2012, 01:25 PM

RE: 38-15 Project - by Chuck Schwark - 08-10-2012, 01:32 PM

RE: 38-15 Project - by codefox1 - 08-10-2012, 02:02 PM

RE: 38-15 Project - by Chuck Schwark - 08-10-2012, 03:22 PM

RE: 38-15 Project - by ipwizard - 08-10-2012, 04:40 PM

RE: 38-15 Project - by ipwizard - 08-13-2012, 01:05 AM

RE: 38-15 Project - by ipwizard - 09-30-2012, 12:39 AM

RE: 38-15 Project - by Ron Ramirez - 09-30-2012, 06:42 AM

RE: 38-15 Project - by TA Forbes - 09-30-2012, 08:32 AM

RE: 38-15 Project - by ipwizard - 09-30-2012, 12:46 PM

RE: 38-15 Project - by Arran - 09-30-2012, 08:41 PM

RE: 38-15 Project - by ipwizard - 10-01-2012, 01:12 PM

RE: 38-15 Project - by Chuck Schwark - 10-01-2012, 03:56 PM

RE: 38-15 Project - by ipwizard - 10-01-2012, 06:32 PM

RE: 38-15 Project - by Chuck Schwark - 10-02-2012, 08:58 AM

RE: 38-15 Project - by Ron Ramirez - 10-02-2012, 09:03 AM

RE: 38-15 Project - by ipwizard - 10-02-2012, 02:13 PM

RE: 38-15 Project - by Ron Ramirez - 10-02-2012, 02:23 PM

RE: 38-15 Project - by codefox1 - 10-02-2012, 02:24 PM

RE: 38-15 Project - by TA Forbes - 10-02-2012, 04:14 PM

RE: 38-15 Project - by LASJayhawk - 10-02-2012, 09:53 PM

RE: 38-15 Project - by ipwizard - 10-03-2012, 12:14 AM

View a Printable Version

Users browsing this thread: 7 Guest(s)

Recent Posts
Philco model 60
This is my thread on 60 from 2016. I had to rewind the osc coil, and I actually counted the turns and then rewound i...morzh — 03:34 PM
Philco model 60
Yes, Mark belongs to the same Michigan Antique Radio Club that I do. I suspect that the oscillator coil is in need of a ...Radios1340 — 03:10 PM
A Marconi model 86
Yeah. I am dreading the thought of what to do with all my consoles when I will no longer be able to move them around. I...morzh — 02:51 PM
1947 Silvertone 7086 Wire Recorder/Phono/Radio on YouTube
Cool gadget, Buzz. I took me a couple of second to undestand that that oscillating thing makes the wire to spool correc...morzh — 02:50 PM
A Marconi model 86
My back hurts already, you could build a house with all the wood. PaulPaul Philco322 — 02:49 PM
1947 Silvertone 7086 Wire Recorder/Phono/Radio on YouTube
Part 4 of this series now uploaded link below to anyone interested Buzz — 02:39 PM
Philco model 60
Welcome to the Phorum, Radios1340! The oscillator coil on the 60 is a common culprit. I just bought a 60B (June 1934) ...GarySP — 02:33 PM
Philco model 60
Yes, standard alignment procedure. I can get the minuscule tone to vary when adjusting the trimmers. But you almost have...Radios1340 — 01:40 PM
A Marconi model 86
An imposing-looking radio, for sure.morzh — 12:43 PM
Philco model 60
Model 60 struck again :lol: Welcome to the Phorum! Above is the article on Model 60. Could be of some use. Now...morzh — 12:38 PM

Who's Online

There are currently 10739 online users. [Complete List]
» 3 Member(s) | 10736 Guest(s)

Login
Username:
Password:	Lost Password?
	Remember me