Quest for Sweet Sound Hits Snag - 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 9th January 2002, 05:54 AM   #1
diyAudio Member
 
Join Date: Dec 2001
Location: Oregon, USA
Question Help needed - resistor/fuse burnout

Thanks for the previous input. I replaced my caps and used the variac since I had it hooked up any way. At about 80 volts input my power resistor started smoking. I replaced this also. I guess I shouldn't have been surprised since the old one was mostly cooked, but I thought it may have had to do with the filter capacitor. The rectifier tube is the 5AR4 with a dual can capacitor and a 100 ohm 10 watt resistor which then goes to the 6BQ5 Screen. Originally the cap was 40/80mfd 400vdc but in replacing I went with a 20/100mfd which I was told would be ok or maybe even better. The cap is a NOS electolytic - could this be the problem.

After the initial start up I shut it down and checked my wiring to make sure nothing was shorting out, and then cranked it up again. It didn't smoke this time. I only took it to about 80 plus volts (enough to get some sound out of the speakers) After a minute or 2 the 2 amp slo-blow fuse went. And I realized I have a problem.

What could cause this excessive current draw?

Once again I greatly appreciate your assistance on trouble shooting this.
Norman
  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
sweet sound aleph-3 or Aleph-x? space2000 Pass Labs 6 28th June 2008 05:36 AM
clean, wrm, sweet sound amp CLass A space2000 Solid State 64 11th May 2008 05:01 PM
Why some amp sound sweet and clean? space2000 Solid State 0 7th May 2008 07:53 AM
quest for ultimate portable all weather sound system tedlevit Introductions 2 10th February 2008 05:46 AM
Another NOOB hits the Web SNAILDARTER Introductions 3 6th January 2005 05:52 PM


New To Site? Need Help?

All times are GMT. The time now is 02:20 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