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12th October 2006, 07:24 AM
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#1 |
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diyAudio Member
Join Date: Apr 2003
Location: Makati
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Is it the 6SN7 or me?
Last night I played with TubeCAD (I'm lazy) cause I wanted to put my 6SN7 to good use. I configured it in SRPP mode given the following conditions: 320V B+, 8mA
According to the results, I'll get 11.29 Av, -3.9 bias, +-44V Vout So I went ahead and ripped off the 6SL7 circuit from my 2A3 and wired in the 6SN7 I wire the lower tube's cathode with two LEDs instead of 470R resistor. When I got to play the amp, I immediately noticed the lack of dynamics and resolution. It was disappointing. Boring sound  What have I done wrong? I've configured this amp to use the Sun Audio circuit (2 stage 6SN7) but did not like it as well. 
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12th October 2006, 08:27 AM
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#2 |
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diyAudio Moderator
Join Date: Jan 2003
Location: Near London. UK
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LED bias works best when the anode load resistance is high - SRPP puts a quite a low load resistance on the lower valve.
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The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference... |
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12th October 2006, 08:18 PM
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#4 |
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diyAudio Member
Join Date: Feb 2004
Location: South Wales
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The 6SL7 removed from your amp has a higher Mu of 70 as opposed to the much lower Mu of 20 of the 'SN7.....
I prefer the sound of the 'SL7 to me, Much more dynamic...
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13th October 2006, 12:31 AM
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#5 |
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diyAudio Member
Join Date: Apr 2003
Location: Makati
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Alastair, yes I was wrong. I thought that having a lower mu tube (I have a preamp) with much more current could improve the dynamics from that of the 6SL7.
I listened to it again last night and it was butchered by my 45 amp with 5842 as drivers. |
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