Here are several vacuum tube amps that I have designed and built over the last several years.
DHT Pre-amp Updated May 2018
A pre-amp designed to work with the 4-pin directly heated triodes
01-A, 30, 31, and 112-A.
A pre-amp using the highly regarded 9-pin 12B4-A tube which was originally designed for use in television receivers.
Single-ended monoblock power amps with the venerable 45 directly heated triode tube with a 6J5 driver.