Changing 6SQ7 to 6SL7 in SE amp

bereanbill · 10th May 2009, 10:07 PM

Ok...last one tonight...maybe...I would like to change the 6SQ7 to a 6SL7 in a SE guitar amp I have. Two reasons :
1 : The 6SQ7 is grid-leak bias, which makes it risky to use any kind of pedal in front to heat up the input, and :
2 : To take advantage of the 6SL7's amp factor ( 70 vs 19 for the pentode.)
Doesn't look to hard...but as always, I don't want to fry anything. This little guy is from 1954 and has a great tone for recording, but not enough break-up to suit the blues/bluesrock side of my personalities....

bereanbill · 21st May 2009, 11:31 PM

Bump ???

Tom Bavis · 22nd May 2009, 12:15 AM

Starting with 6SQ7 or 6SJ7? 6SJ7 has the most potential gain of any of these - and it's easy enough to change to cathode bias. whatever the first stage. Gain (amp factor): 6SQ7: 100, 6SL7: 70, 6SJ7...depends on plate load.

bereanbill · 22nd May 2009, 12:25 AM

Changing to the 6SQ7 looks pretty complicated...for me anyway. I like the idea of the 6SL7 because it's a dual triode..I can add a gain stage to juice it up a bit.
BTW...this is a guitar amp...Danelectro manufacture.

10th May 2009, 10:07 PM	#1
bereanbill diyAudio Member Join Date: Jan 2009	Changing 6SQ7 to 6SL7 in SE amp Ok...last one tonight...maybe...I would like to change the 6SQ7 to a 6SL7 in a SE guitar amp I have. Two reasons : 1 : The 6SQ7 is grid-leak bias, which makes it risky to use any kind of pedal in front to heat up the input, and : 2 : To take advantage of the 6SL7's amp factor ( 70 vs 19 for the pentode.) Doesn't look to hard...but as always, I don't want to fry anything. This little guy is from 1954 and has a great tone for recording, but not enough break-up to suit the blues/bluesrock side of my personalities....

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

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?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read

21st May 2009, 11:31 PM	#2
bereanbill diyAudio Member Join Date: Jan 2009	Bump ???

22nd May 2009, 12:15 AM	#3
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	Starting with 6SQ7 or 6SJ7? 6SJ7 has the most potential gain of any of these - and it's easy enough to change to cathode bias. whatever the first stage. Gain (amp factor): 6SQ7: 100, 6SL7: 70, 6SJ7...depends on plate load.

22nd May 2009, 12:25 AM	#4
bereanbill diyAudio Member Join Date: Jan 2009	Changing to the 6SQ7 looks pretty complicated...for me anyway. I like the idea of the 6SL7 because it's a dual triode..I can add a gain stage to juice it up a bit. BTW...this is a guitar amp...Danelectro manufacture.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)