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8th February 2013, 09:49 AM
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#1 |
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diyAudio Member
Join Date: Jan 2009
Location: Greece
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6SL7 in parallel driving 6550
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8th February 2013, 12:09 PM
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#2 |
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diyAudio Member
Join Date: Feb 2010
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Not tried exactly that schematic but almost similar.
Some comments: - there is no reason to "waste" two triode sections for driving EL34, not even when triode connected - grid resistor can be larger than 100 k when auto bias is used, this improves the linearity of 6SL7 - there are few odd component values; cathode bypass capacitor do not need 450 V voltage rating, 50 V is sufficient, and grid resistor do not need 3 W power rating |
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8th February 2013, 01:02 PM
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#3 |
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diyAudio Moderator Emeritus
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I agree with all the points artosalo brought up.
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8th February 2013, 01:19 PM
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#4 |
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diyAudio Member
Join Date: Aug 2005
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The two sections of 6SL7 could be implemented differently
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8th February 2013, 03:21 PM
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#5 |
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diyAudio Member
Join Date: Dec 2002
Location: Calgary, Alberta
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Strongly disagree with comments about not doubling 6SL7, which is a low transconductance tube. Search on experiences and designs of member yvesm
__________________
Aerodynamics are for people who can't build engines. Enzo Ferrari |
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8th February 2013, 03:36 PM
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#6 | |
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diyAudio Moderator Emeritus
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Quote:
The thing is. For some applications doubling up might be beneficial. For a tube as easy to drive as the EL34. It really is not needed in my opinion. I would suggest the OP finds out for himself. There really is no substitute for trying things out for yourself. |
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8th February 2013, 03:42 PM
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#7 | |
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diyAudio Member
Join Date: Dec 2002
Location: Calgary, Alberta
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Quote:
__________________
Aerodynamics are for people who can't build engines. Enzo Ferrari |
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8th February 2013, 03:43 PM
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#8 | |
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diyAudio Moderator Emeritus
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Quote:
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8th February 2013, 04:11 PM
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#9 | |
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diyAudio Member
Join Date: Feb 2010
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Quote:
leadbelly; what do you think that would go wrong when one 6SL7 instead of two is used to drive triode connected EL34 ? Distortion ? Frequency response ? or what ? But please, do not just say that it does not sound good. Then we nothing to discuss about this. |
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8th February 2013, 04:29 PM
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#10 |
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diyAudio Member
Join Date: Jan 2009
Location: Greece
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I also agree with all the points artosalo brought up.
I was just curious because i never tryied the 6sl7 in SE aplication as driver... Yes! The grid resistor can be increased, and i am thinking of changing the EL34 with 6550. And what do you think that would go wrong when two 6SL7 parallel triodes are used to drive a 6550??? Last edited by nomiconxp; 8th February 2013 at 04:33 PM. |
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