This is my first thread starter so please go easy on me....., l have a few questions if l may, l recently purchased a Vincent SV- 237MK hybrid amplifier, l upgraded the valves (1 x 12AX7 and 2 x 6NIP-EV) to Harma STR (around £15each) the dealer told me " not to bother spending more" even though he had expensive NOS valves available, any way there was a nice improvement in sound however can find virtually information zero about them on the interweb….. anyone know anything about them? Second question, the Gold Lion 12AX7 is supposed to be the valve to go for as the phase splitter- does anyone have experience of this in the Vincent.... or how does The Gold Lion compare to say the uber expensive NOS etc. Last question- phew! What is the best 6NIP-EV valve? l am aiming for a warm, MUSICAL sound with tight bass.... thanks for looking and have a Happy Holiday.