Bugle 2 Faint/Dead Channel - diyAudio
Go Back   Home > Forums > Source & Line > Analogue Source

Analogue Source Turntables, Tonearms, Cartridges, Phono Stages, Tuners, Tape Recorders, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 1st October 2014, 02:35 AM   #1
diyAudio Member
 
Join Date: Sep 2013
Default Bugle 2 Faint/Dead Channel

Hey everyone,
So I built my Bugle 2 over the weekend, pretty stock except for using the TO-99 version of the LM4562 opamps. Anyway, I plugged the unit into my system yesterday and was getting no sound over the right channel. I'm a novice and this is my first diy build so I went back and cleaned up my work a little bit, there were a few cold and starved joints. I plugged it back in after that and I can hear a faint tinny sounding remnant of music coming through the right channel now, almost like it isn't being amplified or equalized at all. When I unplug the working channel a signal at that same level comes through on both speakers. I've tested the channel for continuity and it looks fine. I've tested the voltages across that channel and they seem to be within the proper range. I've tested the voltage legs of the op amps and they look good, as well as testing the op amps input and output pins on that channel for continuity (and I swapped them out with the dip8 opamps just to be sure). No luck. Any ideas? Jim suggested a solder bridge might be the source, but I've looked the board over multiple times and can't find anything.
  Reply With Quote
Old 1st October 2014, 07:44 AM   #2
diyAudio Member
 
Join Date: Sep 2013
Actually I think this should be in the analog source forum...
  Reply With Quote
Old 2nd October 2014, 07:35 AM   #3
diyAudio Member
 
Join Date: Sep 2013
I know this is probably an unsafe way to test this, but I've discovered by pressing my finger on the solder side of the pcb that there is no feedback noise when I touch the rca jack pin, when I touch the resistor at r1r, when I touch the input loading resistor at r2r, but when I touch r3r (a 1.3k ohm resistor) I get a feedback noise. I took the resistor out and tested it and the resistance looked fine (around 1.29k ohms). I've already tried replacing the resistor at r2r but I haven't tested the resistance of either one I've had at that position (I'll do that tomorrow just to make sure I haven't put in two doa resistors in a row, but it seems unlikely). Anyone have any other ideas on what I should try next? Could it be a pcb defect?
  Reply With Quote
Old 2nd October 2014, 07:38 AM   #4
diyAudio Member
 
Join Date: Sep 2013
I've also tried swapping out the film caps from channel to channel with no change. Tomorrow I will try swapping the electrolytic caps and see if that makes any difference. I'm convinced that the result of my caveman testing must mean something though and that the problem is somewhere between r2r and r3r.
  Reply With Quote
Old 2nd October 2014, 12:56 PM   #5
ittien is offline ittien  Viet Nam
diyAudio Member
 
Join Date: Aug 2011
Though if you can take a picture clear enough so people can help out if any wrong resistor. I just built and it work.
  Reply With Quote
Old 2nd October 2014, 08:24 PM   #6
diyAudio Member
 
Join Date: Sep 2013
Click the image to open in full size.
I'm pretty sure the resistors are all in the correct positions but anyone feel free to have a look. The ones at r2 are 61.9k for custom impedance loading.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Tivoli Model Two right channel faint -- fuse replacement? panopticon Solid State 2 13th October 2012 07:37 AM
NAD C350 Amplifier - Faint Channel dheldridge Solid State 0 20th October 2011 03:02 AM
Need help with hum and faint left channel on my S5 Electronics kit Neville Tubes / Valves 4 15th January 2007 10:58 PM
Pioneer A400 faint distortion on right channel Growers Solid State 7 30th April 2004 11:14 AM
One channel has VERY faint output jjdche Car Audio 4 18th March 2004 04:22 PM


New To Site? Need Help?

All times are GMT. The time now is 10:41 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2