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 8th February 2003, 11:28 PM   #1
diyAudio Member
 
Join Date: Nov 2002
Default auto bias on a Quicksilver KT-88 amp

I have read where the newer models of the Quicksilver line sport auto bias that will allow the switch to different tubes without having to mess with bias adjustments. Would this be a good feature to incorporate into my KT-88 mono's? What would be the pro's and con's of this? How hard would it be to perform this modification?

Joe
  Reply With Quote
Old 9th February 2003, 12:23 AM   #2
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Default QS.

Hi,

Quote:
I have read where the newer models of the Quicksilver line sport auto bias that will allow the switch to different tubes without having to mess with bias adjustments.
Forget this for your existing amps,if the manufacturer hasn't provided for this from the start it is almost (meaning not practical) impossible to retrofit on existing models having fixed bias.

Listen and enjoy QS fans,
__________________
Frank
  Reply With Quote
Old 9th February 2003, 01:11 AM   #3
diyAudio Member
 
Join Date: Nov 2002
Frank

Thanks for the reply. If you say it would require too much effort I will forget it and be happy with what I have.
  Reply With Quote
Old 10th February 2003, 05:00 PM   #4
Joel is offline Joel  United States
diyAudio Member
 
Joel's Avatar
 
Join Date: Oct 2002
Location: Brooklyn, NY
To clarify Frank's point - it's not hard to wire in a handful of cathode bias resistors - BUT, you may throw off the negative feedback loop(s) if there are any, and you will change the power output and possibly the loadline. Distortion could also be affected.
  Reply With Quote
Old 15th February 2003, 02:40 PM   #5
wheezer is offline wheezer  United States
diyAudio Member
 
Join Date: Dec 2002
Location: Boca Raton, FL.
Default Cathode Bias

Hi Joe,
Most of Mike's amps these days, and for several years past are self-biasing except for the HIGHER priced ones .
  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
Fixed bias vs. auto bias HFGuy Tubes / Valves 30 14th October 2011 09:45 AM
Quicksilver 8417 bias runaway? popeye4 Tubes / Valves 37 13th January 2008 12:18 AM
EL84 SE auto bias alexmoose Tubes / Valves 10 8th April 2007 02:03 PM
Auto Bias? lpd Tubes / Valves 0 18th February 2007 03:33 AM
Quicksilver Bias Problem Original Burnedfingers Tubes / Valves 13 4th April 2004 04:15 AM


New To Site? Need Help?

All times are GMT. The time now is 06:47 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