A classic old vacuum tube amplifier. Synthesizers sound much better through tubes!

Here is a small mono tube amp that The Peasant picked up cheap at a flea market. Note the selenium rectifiers and lack of any power transformer. Line-Powered amplifiers like this can be dangerous, so use with caution!

Here is a DC amplifier circuit for raising lower solid-state synth voltage signals up to tube level voltages.

Here are a couple of tube flip-flop circuits.

And a tri-state flip-flop circuit. Thank you to Danial Stocks for this circuit!

Here is a circuit The Peasant put together to generate the "snares" sound in a percussion synthesizer. A basic trigger and output circuit are included for stand-alone use.

Here is a circuit for matching diode voltage drops at different currents. Useful for building balanced modulators.