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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: Question on feedback and transformers posted by lipmanl on January 17, 2007 at 14:00:25:
Lipmanl>> I'm not keen on multistage feedback.
Me too (although I would use much stronger language).
>> Is a reasonable alternative ...
The purpose of global feedback is because of 0 volt crossover
non-linearities in the output stage (ie UL or pentode outputs)
not to correct any imperfections in the output transformer.
Also to lower output impedance - to drive those really
obnoxious speakers and get nearer to SS bass performance.
When in class AB or B the 0 volt crossover is horrendous
and needs to be corrected or masked by the global NFB.
The answer is to use tubes in triode class A and
then NFB can be thrown away without consequence
(except higher output impedance).
Sound is so much better in class A triode -
clearer and more detailed in the low level signals.
Well that's my story and I'm sticking to it 8^DDanL
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Follow Ups
- Re: Question on feedback and transformers - danlaudionut 18:18:11 01/17/07 (0)
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