Moth Audio custom s45 direct reactance drive - fixed bias, zero feedback - 45 or 2a3 SET (1.8-5wpc output). 3k Electra-Print OPT / 13w plate disipation. Customization includes Borne 10k pot / Exotica teflon coupling caps / Kiwame carbon film resistors / .015~600v nos polypropylene psu by-pass of LCR 'lytic / CTC "blowtorch" silver wire / Gibson speed dial volume knob. Tube compliment: EML solid-plate 45 / Mullard gz32 5v4g / Sylvania d-getter 6an4.