The API Select T12 is a classic 2-channel, all-tube, Class-A microphone preamplifier designed with API's proprietary AP2516 transformer in the input stage and a custom API transformer on the output stage. Built with 12AT7WC and 12BH7 dual-triode vacuum tubes, the T12 represents a new and exciting variation in API's preamplifier technology and provides the user with unique tonal options.
An impedance switch to match the input perfectly to all types of microphones, an overload indicator and 2 dB gain steps.
The OS1 was developed around the 6SN7 vacuum tube. The 6SN7 was developed in 1939 and, over the years, has become my personal favorite and often considered king of the general-purpose audio triodes.