Deacy Amp was a guitar amp used by the British Rock Band 'Queen'. It was constructed by Queen's bass guitarist, Electrical Engineer John Deacon. Did Queen or John Deacon ever release any circuit diagram of that amplifier? I can see some pictures of that amp in google. I saw one or two circuit diagrams too but don't know if those are authentic.

 

Not that I am aware of.
I also love vintage guitar amplifiers, which steered the path for me for an electronics hobby to become a 49-year long career.