jadi jpJADIS JP-200 Pre-Amplifier Board AR (Including 6P14*2+6N2*2 6N4*6 Tubes) $280 Dec 5, 2022 eBay Diy JADIS JP200 Circuit PCB board Diy HiFi Blank Preamplifier board $20 Dec 18, 2021Jadis JP-200 FEATURE. 1. Circuit desn is with reference to the classical Jadis JP-200. 2. 12AX7 x 6 pcs for amplfication. 3. Independent power supplies for tube power and tube filaments. 4.