El-retur
Hi-Fi freak
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20W Class A tube input MOSFET SE output Borbely architecture PCB 1 piece! | eBay
This architecture was based on a hybrid headphone amplifier designed by Borbely. It was eventually adapted as a power amplifier. This is the bare PCB of a pure class A MOSFET amplifier, output power 20Wrms at 8 ohms loading.
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