The inspiration for this project was given by Mark Houston who wrote up his experiences of making and modifying the Spare Time Gizmo amplifier described in Nuts and Volts magazine. Marks experience was that with a few mods the quality of this cheap valve audio amplifier could be able to out perform many of the expensive Solid State counterparts.

The Printed Circuit Board arrives.


 These are the Spare Time Gizmo schematics.6T9 Single-Ended Tube Amp Schematic
Figure 1: 6T9 Single-Ended Tube Amp Schematic

6T9 Valve Amp Power Supply Schematic