Push-Pull 6V6 Amplifier
This amplifier was a gift to my father-in-law for Christmas a few years back. It is a distributed load push-pull output topology called “Ultra-Linear” back in the day. That is driven by a direct-coupled split-load phase inverter, preceded by a single gain stage, all using the common 12AU7. With this circuit no preamplifier would be needed, as my father-in-law has a turntable with line-level output.
This schematic represents possibly the best bang-for-your-buck project I’ve done. Although parts were purchased new to ensure a “shiny & new” appearance, they were not expensive. This circuit contains all of the features that make tube amps what they are while minimizing inherent drawbacks.