Changing 6SQ7 to 6SL7 in SE amp - diyAudio
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Old 10th May 2009, 10:07 PM   #1
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Question 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....
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Old 21st May 2009, 11:31 PM   #2
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Bump ???
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Old 22nd May 2009, 12:15 AM   #3
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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.
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Old 22nd May 2009, 12:25 AM   #4
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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.
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