Integrated amp will not turn on - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves

Tubes / Valves All about our sweet vacuum tubes :) Threads about Musical Instrument Amps of all kinds should be in the Instruments & Amps forum

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 11th August 2011, 10:30 PM   #1
mjock3 is offline mjock3  United States
diyAudio Member
 
Join Date: Jan 2011
Location: Wisconsin
Default Integrated amp will not turn on

I have a Sonic Frontiers Integrated amp that decided not to turn on this morning. There is power, the fuse is good, the switch is good. Where do I go from here to find out why I am not getting power. I checked at the diodes high voltage and I have nothing.

Thanks,

Mark
  Reply With Quote
Old 11th August 2011, 10:57 PM   #2
diyAudio Member
 
Join Date: Sep 2004
Location: Minneapolis, Minnesota, USA
Did you check the power transformer primary for continuity?

Mike
  Reply With Quote
Old 11th August 2011, 11:30 PM   #3
mjock3 is offline mjock3  United States
diyAudio Member
 
Join Date: Jan 2011
Location: Wisconsin
Yes it has continuity.
  Reply With Quote
Old 11th August 2011, 11:43 PM   #4
diyAudio Member
 
Join Date: Sep 2004
Location: Minneapolis, Minnesota, USA
So if you put the power switch in the "on" position do you get continuity at the AC power plug terminals?

Mike
  Reply With Quote
Old 11th August 2011, 11:57 PM   #5
mjock3 is offline mjock3  United States
diyAudio Member
 
Join Date: Jan 2011
Location: Wisconsin
Yes, I do.

Mark
  Reply With Quote
Old 12th August 2011, 12:23 AM   #6
wa2ise is offline wa2ise  United States
diyAudio Member
 
wa2ise's Avatar
 
Join Date: Apr 2005
Location: NJ
Quote:
Originally Posted by Michael Bean View Post
Did you check the power transformer primary for continuity?
Check the high voltage secondary for continuity as well (disconnect the power plug first!). Did the tube heaters light up?
__________________
  Reply With Quote
Old 12th August 2011, 12:31 AM   #7
diyAudio Member
 
Join Date: Sep 2004
Location: Minneapolis, Minnesota, USA
OK, primary circuit is good. Move over to the secondary and check for continuity, you should disconnect the secondary leads to get an honest reading. If that's OK, check the rectifier diodes (use multimeter diode check function) with the transformer leads still disconnected. If those are OK, check all connections in the power supply circuit to make sure there aren't any bad ones.

Mike
  Reply With Quote
Old 12th August 2011, 12:34 AM   #8
mjock3 is offline mjock3  United States
diyAudio Member
 
Join Date: Jan 2011
Location: Wisconsin
High voltage secondary has a reading of 58.8 ohms. No the heaters did not light up.

Thanks,

Mark
  Reply With Quote
Old 12th August 2011, 12:39 AM   #9
diyAudio Member
 
Join Date: Sep 2004
Location: Minneapolis, Minnesota, USA
OK, you're zeroing in on the problem now. Are none of the heaters working, or just some of them?

Mike
  Reply With Quote
Old 12th August 2011, 12:50 AM   #10
mjock3 is offline mjock3  United States
diyAudio Member
 
Join Date: Jan 2011
Location: Wisconsin
Thanks, I've got it. One of the wires came loose from the crimp. Fixed it and it is firing up again. THANKS ALOT!!

Mark
  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
Full-turn/partial-turn pots slowpogo Parts 1 12th January 2007 07:40 AM
Is it possible to turn integrated tald Solid State 4 23rd October 2006 01:09 AM
SAE 2400 turn on/turn off pop Glen B Solid State 16 31st July 2006 01:32 AM


New To Site? Need Help?

All times are GMT. The time now is 03:17 PM.


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