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Old 1st November 2012, 08:44 PM   #1
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Default MC Step-Up OTL Stage (grounded-grid) for MM RIAA Head Amps

about
Teflon coupling capacitors & More No-Gain—No-Pain Tube Buffer Circuits
I have found such examples.
I want to know commercial RIAA phono preamps where such topologies are in use.
Thank you for advices.
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Old 2nd November 2012, 01:12 AM   #2
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The amount of capacitance needed at the I/P is HUGE, in order to obtain good bass performance. Both physical size and monetary outlay are prohibitively expensive, if PTFE dielectric is to be employed.

If you want to do LOMC phono, without a step up trafo (SUT), investigate Allen Wright's hybrid cascode.
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Old 2nd November 2012, 09:07 AM   #3
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the right electrolytic capacitors in signal pad (biased condition) is no audible disadvantage, so I think (additional - dc coupling is dangerous for moving coil cartridges).
Check out MLGO+ about
http://www.mundorf.com/english%201.1/kondensatoren2.htm

Last edited by tiefbassuebertr; 2nd November 2012 at 09:09 AM.
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