Jax' place

Power emplifiers with tubes

This was my first fully working push-pull power amplifier. The circuit is well known in the history with a single input stage and an LTP phase splitter but unlike most I used a low gain triode as input. Feedback is applied to the cathode of the input stage just like most classic designs. The output tubes run in ultra-linear class A producing a mere 22W, well below what a pair of EL34 is capable to. Nice sound and I used it for many years.

picture of EL34 PP amp

Simple design but with a complicated power supply with 2 high voltages. 350V to the input stages was a little too low and 400V to the output a little too high.