I seldom link projects or articles but this is an exception. Please visit Ale's website and read his just published article on a 300B Single Ended amplifier. It IS different from most other 300B designs seen around as it uses intriguing electronic solutions and a modular build-up. A bit technical but imho a must read. Enjoy!
https://www.bartola.co.uk/valves/300b-se-amplifier/
Photo taken from his article at www.bartola.co.uk/valves/
audio with realistic timbre