The Audiophile's Project Sourcebook: 80 High-Performance Audio Electronics Projects -- by G. Randy Slone. Click the picture to read more....
Wire frame of the free form crystal cmoy amp.
Soldering up the framework.
Crystal Amp Core.
Crystal amp headphone Amplifier
Free form tube base headphone amplifier.
Crystal amp in Sapphire Blue.
Crystal amp with muses02 + Nichicon muse caps.
Crystal amp headphone Amplifier in Emerald green.
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cmoy amplifier circuit
WooAudio WA6SE. One is a dedicated power tube, and one is a dedicated drive tube. ($1050)