The 503HTA, designed and manufactured by Pi2Media, is an I/O shield for Raspberry Pi designed to provide “valve sound” audio for the single board computer. This HAT allows the Raspberry Pi to drive headphones from 32 – 300ohm. The on-board PCM5102A, 24-Bit at 192kHz DAC drives the single stage 6DJ8 (aka 6922) tube. The Class-A …
Read full article: Raspberry Pi valve amp add-on goes on sale for $159