Rozenblit OTL (Glass Audio 1990) - a honest performer
77.43.10.3 |
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| Posted on November 5, 2009 at 04:07:51 | ||
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Posts: 98
Joined: September 10, 2009 |
 I think that this 'classical' circuit can be fully classified as "Futterman Type". At the time, when I considered this option as a viable alternative to my "Modified Futterman", it seemed to me very attractive. However, as I am quite suspicious about multiple feedback loops, I finally decided to do my way (one direct voltage feedback from output to input). The simulated performance of this circuit shows a predominant content of second and third harmonic (see attached spectra). In my opinion, the main simulated area of concern of this circuit is that there is significant time domain transient envelope distortion following the step application of the input signal (see the attached graph @ medium current level). Best Regards Luca Cellai ecc230
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 Transient Response - 6AS7_6SN7 04:16:19 11/05/09
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Spectrum @ 1350 mA peak 8 Ohm - 6AS7_6SN7 04:12:51 11/05/09
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Spectrum @ 1050 mA peak 8 Ohm - 6AS7_6SN7 04:11:23 11/05/09
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Spectrum @ 700 mA peak 8 Ohm - 6AS7_6SN7 04:10:10 11/05/09
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Spectrum @ 350 mA peak 8 Ohm - 6AS7_6SN7 04:09:12 11/05/09
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| Spectrum @ 1350 mA peak 8 Ohm, posted on November 5, 2009 at 04:12:51 | |
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Posts: 98
Joined: September 10, 2009 |
 Spectrum @ 1350 mA peak 8 Ohm (onset of output compression) ecc230
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| Spectrum @ 1050 mA peak 8 Ohm, posted on November 5, 2009 at 04:11:23 | |
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Posts: 98
Joined: September 10, 2009 |
 Spectrum @ 1050 mA peak 8 Ohm ecc230
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| Spectrum @ 700 mA peak 8 Ohm, posted on November 5, 2009 at 04:10:10 | |
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Posts: 98
Joined: September 10, 2009 |
 Spectrum @ 700 mA peak 8 Ohm ecc230
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| Spectrum @ 350 mA peak 8 Ohm, posted on November 5, 2009 at 04:09:12 | |
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Posts: 98
Joined: September 10, 2009 |
 Spectrum @ 350 mA peak 8 Ohm ecc230
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