The K-12M kit is a push-pull stereo
power amplifier rated at 8 watts per channel. Included with the kit is a kit assembly and operating manual, drilling template and schematic. The assembly instructions are fairly brief and do assume that the builder has soldering and basic electronics skills.
The
amplifier does not come with an enclosure, but rather a 7.25" × 9.5" pine board. The photographs below show the typical contents of a K-12 tube amplifier kit as well as an assembled tube amp kit on a pine board. Provided you have some soldering skills, the tube amplifier kit can be easily put together on the pine board in a couple of hours.
K-12M Tube Amplifier Circuit
While the stock kit as provided is completely functional, the lack of an enclosure does not make it desirable in most environments. For that reason, the K-12M will most likely need to be fit into some sort of enclosure. For those who do not want to do any metal work, you can purchase a metal enclosure for the K-12M from S-5 Electronics.
The power switch and knobs are from
Radio Shack. I used insulated wire from a salvaged amplifier for the input and pot leads. The PCB is suspended from the top of the chassis using screws and the nylon spacers provided with the kit. I had read that the tubes run hot, so I tried to get as much of the tubes and ceramic sockets sticking out of the enclosure as possible to provide better cooling. The handles are from some old cupboards.