6BQ5 Bias Point Help - diyAudio
Go Back   Home > Forums > Amplifiers > Tubes / Valves
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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
Thread Tools Search this Thread
Old 24th December 2010, 08:44 PM   #1
diyAudio Member
Troncones's Avatar
Join Date: Dec 2009
Location: Orange County, California.
Default 6BQ5 Bias Point Help

Is there a better way to determine bias point and grid volts for different Vg2 volts besides looking at the Vg2=250V curves and guessing?
The Myth: A hand full of Tubes, Caps, Resistors and Iron and you have an Amp. The Reality: You have self induced Dementia. Newbie.
  Reply With Quote
Old 25th December 2010, 03:08 AM   #2
diyAudio Member
Tom Bavis's Avatar
Join Date: Jun 2002
Location: Macedon NY
Use the triode curves and you'll be close, since the current will only go up slightly with higher plate voltage.
  Reply With Quote
Old 25th December 2010, 06:42 AM   #3
diyAudio Member
artosalo's Avatar
Join Date: Feb 2010
Is there a better way to determine bias point and grid volts for different Vg2 volts besides looking at the Vg2=250V curves and guessing?
Sometimes I have made pure experimetal tests by having all variable voltages (supply-, g2- and -g1-voltage) for a tube under test and also variable load resistance.

Then all required combinations can be tested and the results are fully "live".

I see this as the best way if not suitable data is available.
I have used this method for some soviet-made output tubes with good results.

Ofcourse this requires that one has some test equipment available.
  Reply With Quote


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
Finding bias point in PP fixed bias beamnet Tubes / Valves 14 7th December 2008 01:25 PM
Fixed Bias 6BQ5? ThSpeakerDude88 Tubes / Valves 3 19th August 2007 02:41 AM
bias voltage for 6BQ5 plate briansdad Tubes / Valves 3 14th December 2004 06:03 PM
really dumb question about SE 6bq5 operating point (triode) zobsky Tubes / Valves 5 10th April 2004 12:07 PM
Battery bias below EL84/6BQ5 DrewP Tubes / Valves 9 6th September 2003 12:16 AM

New To Site? Need Help?

All times are GMT. The time now is 01:51 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2