The Dynaco ST-70 was the company’s first stereo amplifier. It utilized four EL34 output tubes, one GZ34/5AR4 rectifier tube, ...

Like Folkvangr, the Schiit Valhalla 3 operates as a OTL/OCL design—no output transformers, no capacitors in the signal path.

The design is inspired by the guitar amps of the 1950s and 1960s so ... two stage double triode preamp and a single power output tube. The transformers are usually the difficult part of a build ...

Despite the oldest solid state audio circuitry now qualifying for a pension and a bus pass where this is being written, the thermionic tube retains ... a tap on the output transformer feeding ...