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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: feedback posted by acres verde on October 4, 2010 at 08:26:03:
Personally Always like OTL Circlotron Power Amps sound when they play without any GNFB.(Global Negative Feedback-from output stage to input stage)
But must pointed next:Local Negative Feedback isue
OTL Circlotron Output Power Stage allready work with 100%negative feedback,basicly beacose this stage are built from Two(SE OTL) Cathode Follower power Amps joined together in PP Circlotron Output Power Stage.(or four or more SE OTL stage joined together in case of Multiphase Output Circlotron Power stage system)
Same thing( 100%local Feedback) is valid for DC coupled CF Diferencial Driver stage too.
Input Diferencial Dual Cascode Gain stage(in case of ATMA-SPHERE Amps) is very good Engineered too, so produce very low distortion.
All This separate stage relative low distorsion, stage by stage together, results in High Definition OTL Power Amplifier which dont need any GNFB to sound Good.
Relative Lot of GNFB is actually general `cure` fore Bad designed(stage by stage) OTL power Amps,but that (GNFB) general `cure` made only good results for Osciloscope or Distortion Analyzer and NOT for listener(Human) Ear`s.
Actually OTL and other Amps with relative Lot of GFNB have some better punch in Bass area, but lose significant in overall sound definition( 3 D space,highs and natural definition)
With all that above in our mind`s only which can we do is too choose asociated and appropriate (LOAD)SPEAKER for our High Definition OTL Circlotron Amplifier, this (LOAD)SPEAKER is usually with relative higher impedance but with Sonically Superior final Results.
Good Luck to All
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Follow Ups
- RE: feedback - Banat 10:56:01 10/07/10 (0)
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