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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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OTL Asylum OTL, Output Transformerless Amplifier User Group. |
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In Reply to: RE: Reference 3A NEFES posted by ltman on March 19, 2024 at 11:28:30:
Usually the output transformer is the bandwidth limit of any tube amp, save for perhaps some tuning on the bottom end to reduce the possibility of saturation.
The ZEROs convert from 16 Ohms down to 4,3 or 2 Ohms so have a really low turns ratio. Owing to it being an autoformer (since it does not have to block DC) rather than a transformer, there isn't any interwinding capacitance. So its bandwidth is a lot higher than that of the OTLs themselves.
In the case of lower impedances, the amps aren't showing off their best stuff! You get more power, lower distortion and less heat (since more power developed by the output section is dissipated in the load rather than in the output section itself) with no down side.
This kind of amplifier would not be possible if DC were present at the output and the amp not already fairly low output impedance!
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Follow Ups
- Not exactly. - Ralph 08:00:13 03/20/24 (1)
- RE: Not exactly. - ltman 13:49:04 03/21/24 (0)
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