ieales-"Tubes won't help. The signal bears no relationship to the original signal and the lost information cannot be recovered"
This statement is completely false and reflects confusion, ignorance and/or misinformation about the nature, function and operation of vacuum tube equipment. While I accept and understand you're apparent distaste and dissatisfaction with tube equipment, it is by design and operation a simple, demonstrative and scientific fact that the output bears a distinct relationship to the input signal which can be proven by simple math. If you can not accept, understand, and acknowledge this simple, basic, and fundamental premise then explain to the rest of us where the vacuum tube circuit gets it's output if it "bears no relationship" to the input do you think it collects it's output signal from thin air?