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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: the effect of feedback on output impedance posted by Ralph on July 25, 2012 at 08:09:51:
Great explanation of GNFB and I totally agree. In the real world, GNFB tends to suck the life out an amp the more you use and all who have tested this would probably agree.
My concern was REAL linearity and as you correctly put it GNFB only serves to improve the apparent OP impedance and distortion. So on an apples for apples basis with zero or minimal fixed GNFB, the greater number of tubes in parallel the lower the REAL output impedance and the better the load line.
The tubes used in most OTLs do not exhibit great linearity over very wide voltage swing so if you are managing to minimise GNFB whilst maintaining reasonable power and efficiency your techniques must be commended.
I think this in essence was what Tre was saying and I won't dispute your numbers because you don't stay in business for 30yrs plus without doing something right:-)
Naz
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Follow Ups
- RE: the effect of feedback on output impedance - Naz 17:36:16 07/27/12 (3)
- RE: the effect of feedback on output impedance - Ralph 13:34:44 07/30/12 (2)
- 7242 for higher mu? - Lew 12:48:49 07/31/12 (1)
- RE: 7242 for higher mu? - Ralph 13:03:52 07/31/12 (0)
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