6SL7 alternatives? - 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 8th September 2009, 07:36 PM   #1
Cobra2 is offline Cobra2  Norway
DIY !
diyAudio Member
 
Cobra2's Avatar
 
Join Date: Apr 2002
Location: Stavanger, Norway
Send a message via Skype™ to Cobra2
Default 6SL7 alternatives?

I found this (chinese) 300B PP amp, using 6SL7 as first tube (and 6SN7 as driver).
But doing a drawing of the internals, I find the 6SL7 connected as one triode (both in paralell).
The 6SL7 has a touch much gain, so a 6SN7 does the job almost just as good...

Now, I was thinking, is there a single-triode (octal) 6SL7, or something between SL and SN, or would maybe a 6J5 be a simpler sollution?

Arne K
__________________
Don't believe everything you think...
  Reply With Quote
Old 8th September 2009, 08:14 PM   #2
Yvesm is offline Yvesm  France
diyAudio Member
 
Yvesm's Avatar
 
Join Date: Jul 2004
Location: Ardeche
Take a look at 6EA7/6EM7.
OK, the large triode is a bit too beefy but it could easyly replace the half 6SN7 while the small section really loos like an half 6SL7.

Yves.
  Reply With Quote
Old 8th September 2009, 08:15 PM   #3
diyAudio Member
 
Join Date: Nov 2005
6SF5 and 7B4 are both pretty close to a single section of a 6SL7 or 12AX7.
  Reply With Quote
Old 8th September 2009, 08:36 PM   #4
Cobra2 is offline Cobra2  Norway
DIY !
diyAudio Member
 
Cobra2's Avatar
 
Join Date: Apr 2002
Location: Stavanger, Norway
Send a message via Skype™ to Cobra2
Default thanks...

Loctal would fit (w/adapter)...octal preferred, so the existing socket could stay.

I do not think this first tube needs any "drive", but will disconnecting one half do any unexpected changes? (in front of the 6SN7, that is the splitter/driver).

Arne K
__________________
Don't believe everything you think...
  Reply With Quote
Old 8th September 2009, 08:42 PM   #5
diyAudio Member
 
Join Date: Nov 2005
The 6SF5 is octal. You can also just use half of the 6SL7.
  Reply With Quote
Old 8th September 2009, 08:48 PM   #6
jane is offline jane  Norway
diyAudio Member
 
jane's Avatar
 
Join Date: Jul 2004
Location: Norway
6SQ7 (~1/2 6SL7 + 2 diodes).

jan.
__________________
Life is hard - Then you die.
  Reply With Quote
Old 8th September 2009, 08:49 PM   #7
Cobra2 is offline Cobra2  Norway
DIY !
diyAudio Member
 
Cobra2's Avatar
 
Join Date: Apr 2002
Location: Stavanger, Norway
Send a message via Skype™ to Cobra2
Quote:
Originally Posted by jon_010101 View Post
The 6SF5 is octal. You can also just use half of the 6SL7.
This would be the simplest "upgrade", I think. But, since it has a tad too much gain, would a 6J5 (and maybe a reduction in feedback) do the job better?

Arne K

6SQ7 is interesting, but not in my collection (yet)...
__________________
Don't believe everything you think...

Last edited by Cobra2; 8th September 2009 at 08:52 PM.
  Reply With Quote
Old 8th September 2009, 08:57 PM   #8
diyAudio Member
 
Join Date: Nov 2005
If the 6SL7 is in parallel, using one section only won't change the gain. Both sections in parallel are likely important to allow sufficient drive for the 6SN7 stage. A 6SN7/6J5, however, would reduce gain significantly.
  Reply With Quote
Old 8th September 2009, 08:57 PM   #9
diyAudio Member
 
aardvarkash10's Avatar
 
Join Date: Mar 2007
Location: Auckland, NZ
Default 6j5 is your answer

octal smooth and cheap as chips
__________________
"Folks, you can't prove truthiness with information. You prove truthiness with more truthiness. In a process known as truthinessiness." - Stephen Colbert, The Colbert Report
  Reply With Quote
Old 8th September 2009, 10:00 PM   #10
Cobra2 is offline Cobra2  Norway
DIY !
diyAudio Member
 
Cobra2's Avatar
 
Join Date: Apr 2002
Location: Stavanger, Norway
Send a message via Skype™ to Cobra2
Default MingDa 300B PP

My napkin drawings..:

Arne K

Coments, please
Attached Images
File Type: gif Scan10002a.gif (36.2 KB, 314 views)
File Type: gif Scan10002b.gif (25.8 KB, 305 views)
__________________
Don't believe everything you think...
  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
6X5, 2x 6SL7 & a 6v6GT.... jmsjabb Tubes / Valves 0 11th January 2009 06:13 PM
6SL7 5E3 - together at last? atmars Tubes / Valves 12 24th November 2008 01:59 AM
6sl7 nhuwar Tubes / Valves 6 23rd August 2008 03:29 PM
6sl7 omom123 Tubes / Valves 0 23rd August 2007 07:11 PM


New To Site? Need Help?

All times are GMT. The time now is 12:47 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