I have made another power supply for the balanced-output preamplifier. There are 2 major improvements: (1) Electrolytic capacitors replaced with ceramic ones (2) Connection of the audio transformers as chokes modified. Some enthusiasts in …

I made a pair of line cable between balanced pre-out to balanced power-input. The cable consists of 3 braid cables because the balanced line requires 3 lines. It is unusual because, Unshielded line cable Line cable made of split low-end Mo…

The circuit is really simple (see figure). These tubes are two of 7370 (40V version of 5687WA). Heater is connected to AC input along with 270R (for 117V AC), or 150R (for 100V AC). It is strongly recommended that average output current do…

I made a vacuum tube power supply for semiconductor (aka Kaneda #168) preamplifier. I have surplus dual triode (7370). It seems it is tough enough to use for a small output rectifier with Grid and Plate connected together. Thus dual triode…