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About the ZH230
The David Berning Company ZH230 is a dual 30-watt stereo power amplifier using David Berning’s ZOTL (Zero-Hysteresis Output Transformerless) technology. It is designed to provide faithful amplification with automatic biasing for various tube combinations, constant output impedance behavior, and high reliability. Review coverage describes it as an updated lower-power successor to the older ZH-270, with a switched-mode power supply, fully balanced amplification circuitry, and tube rolling flexibility. The model was available with a listed price of $8,360 in one review and $8,630 in another source.
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