Hi everyone. This is merely a question out of interest. I own both a Warwick Quad VI and a Warwick Tubepath 5.1 - both magical sounding amps. These are hybrid amps - the Quad has 3 preamp tubes and the Tubepath has 2, however both these amps us a single EL84 in the power stage before the Mosfet power section. I think the same design has been used in the SWR Interstellar and the Mesa M-Pulse heads. Just wondering what the idea around this design is in regards to tone? Both my Warwick amps sound amazing, but are different. The Quad VI stays clean no matter how hard you drive the input gain, whereas the Tubepath gets quite gritty and gnarly when the input is pushed. both amps offer a way of either engaging or bypassing the power amp tube. It's most noticeable in regards to tone with the Tubepath. Any thoughts or opinions?