Proco /RAT. ハンドメイド。Proco Rat diy project Classic 1986 rat schematic with added。Proco Rat diy project Classic 1986 rat schematic with added。Proco Rat diy project Classic 1986 rat schematic with added。。オペアンプにNational Semiconductor製LM308使用ハンドメイドエフェクターにご理解頂ける方