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 23rd March 2012, 09:57 AM   #1
ryuji is offline ryuji  United States
diyAudio Member
 
Join Date: Feb 2011
Location: massachusetts
Default given choice of low screen voltage or low bias which sounds better or is it equal

i would like to know some opinions given the choice of low(ering) g2 voltage, or supplying a more negative g1 bias, which one is better for sound, or are they pretty much equivalent solutions

guess in less words, adjust gain or adjust driving voltage? from the over simplified statement im thinking that answer might be the gain as it would drop down the noise floor. Guess im a bit partial to this solution, as it has an additional benefit of potentially permitting me to reduce component count as my driver and output screens could be directly driven by the same supply?
  Reply With Quote
Old 23rd March 2012, 01:26 PM   #2
TheGimp is online now TheGimp  United States
diyAudio Member
 
TheGimp's Avatar
 
Join Date: Aug 2009
Location: Johnson City, TN
What tube?

Lowering the Screen voltage will compress the gain and depending on the tube may increase distortion.
  Reply With Quote
Old 23rd March 2012, 01:32 PM   #3
ryuji is offline ryuji  United States
diyAudio Member
 
Join Date: Feb 2011
Location: massachusetts
gu-50, was thinking of 100~150v

heres all my collected data on them
Index of /data/Datasheets/gu-50

the other affected tube is 6cb6's, but there designed for less then 150v anyways
http://ryujiwarui.com/data/Datasheets/6cb6.pdf


oh and i only need about 40 mA bias from them

my friend tried the pair i mailed him with very low g1 dc voltage (iirc, about -60v) and said they sounded better then what i am presently using for tubes, so im trying them out =)

oh and if it isnt already evident, this is SE operation

Last edited by ryuji; 23rd March 2012 at 01:39 PM.
  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
Low noise, low microphony, low hum valves MarcelvdG Tubes / Valves 38 28th January 2013 08:42 PM
fixed bias with low plate voltage dscottguitars Instruments and Amps 10 28th February 2012 11:13 PM
preamp supply LOW power LOW noise LOW cost drdagor Power Supplies 1 13th September 2010 11:39 PM
Bias problem- 1 Socket shows extremely low bias! otokomae Tubes / Valves 12 31st December 2008 10:01 PM
Equal-Loudness Curves for low frequencies? Sjoerd v L Subwoofers 4 9th June 2005 10:22 PM


New To Site? Need Help?

All times are GMT. The time now is 02:08 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