This is it! The ECP Audio TORPEDO Printed Circuit Board. ECP Audio has provided the most unique tube PCB application for headphone audio DIY (Do It Yourself). Full details and building construction may be found on the Torpedo Parafeed Amplifier website.

The Torpedo achieves unique integration of a tube-transformer-coupling parafeed amplifier. We at Beezar do not believe that there is another high-voltage tube amplifier available for DIY that is completely integrated onto a single PCB. Transformers - including the power transformer - are mounted directly to the PCB. The only wiring required is a safety ground and the ground wire for the Blue Velvet ALPS volume pot. Even the RCA jacks are soldered directly to the PCB. Refer to the Torpedo website and DIYForums.org for details on the Torpedo development.

Board Dimensions: 3.97" wide x 13.95" (100mm wide x 354mm)
Board Construction: 2oz copper on an 0.062" (1.6mm) FR4 dielectric