Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Instruments and Amps Everything that makes music, Especially including instrument amps.

1946 Gibson BR-4 Amplifier tube question
1946 Gibson BR-4 Amplifier tube question
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 4th March 2007, 03:11 AM   #1
Frazzled is offline Frazzled  Canada
diyAudio Member
Frazzled's Avatar
Join Date: Apr 2004
Location: Regina, Saskatchewan
Default 1946 Gibson BR-4 Amplifier tube question

I have an amplifier that uses both a 6SL7 and a 6SN7. Can someone please outline the differences between these two tubes and why couldn't I interchange them.


A copy of the schematic...
Click the image to open in full size.
Anything worth trying is worth failing at once or twice.
  Reply With Quote
Old 4th March 2007, 06:49 PM   #2
Tom Bavis is offline Tom Bavis
diyAudio Member
Tom Bavis's Avatar
Join Date: Jun 2002
Location: Macedon NY
You COULD interchange them, but the phase inverter will be unbalanced - it's set up for the lower gain of the 6SN7. Bias will be wrong for both stages too, but may be close enough... note the different cathode resistors used. But expect increased distortion at the least.
  Reply With Quote


1946 Gibson BR-4 Amplifier tube questionHide 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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Gibson GA-15RV tube amp Szyderca Instruments and Amps 8 9th May 2013 10:11 PM
Gibson tube amp mod for JAZZ packman Instruments and Amps 41 4th January 2013 01:44 AM
1946 Philco Tube Receiver tryonziess Tubes / Valves 18 1st February 2010 11:54 AM
Restoring 1948 Gibson GA-30 guitar amp(tube) Tristanc1 Instruments and Amps 5 21st February 2008 05:38 PM

New To Site? Need Help?

All times are GMT. The time now is 11:39 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright ©1999-2017 diyAudio