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12th March 2007, 01:53 PM
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#1 |
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diyAudio Member
Join Date: Mar 2004
Location: Albury NSW Australia
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To SRPP or not?
I have searched the threads but of course the debate rages... Whats the lowdown on SRPP... vs Cathode follower (with regards to a 6sn7 preamp) and what if you convert the srpp into a true ccs? what then. Is this all about cancellation of the second harmonics and harshness (read odd order harmonics)
what are the ads/disads? Thanks for your help Nick
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"Better to say nothing and keep them guessing than to speak and remove all doubt." |
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12th March 2007, 02:45 PM
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#2 |
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diyAudio Moderator
Join Date: Jan 2003
Location: Near London. UK
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Briefly...
SRPP has gain; a cathode follower generally has about 1dB loss. SRPP doesn't have the full gain of mu, so it has significantly higher distortion than a mu-follower. The distortion of the lower valve has to be very low before there's any cancellation with the upper valve (effectively a cathode follower), so that means that only mu-followers need apply for cancellation, and even then the effect is barely noticeable.
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12th March 2007, 03:01 PM
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#3 |
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diyAudio Member
Join Date: Feb 2006
Location: Vaenersborg, Sweden
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They have low output impedance BUT that doesn't mean they can source unlimited current.
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/Magnus 
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