Hi Sdrenslow
you say:
>>> I have always wondered why the BAT VK-P5 and VK-P10 phonostages do not use the 6H30 tubes...<<<
I actually think both are 'older' designs and pre-date the serious use of that 'MIG-fighter' tube.
Also until more recently the realisation of an improved power-supply circuit for 6H30 was not fully realized. Tube socks and what else was used to make them sound more 'harmonic'.
Only once the power-supplies issues were resolved did it improve this 'over-cooked' characteristic.
I've heard the VK31SE and it still didn't do it for me then. Those tubes, said to be very long lasting/robust yet the reason given in this case was that the tubes had 'gone'.
It sounded like a tube trying to do solid-state, as bad an idea as some SS amps tried to sound like tubes.
I guess similar events must have put some people off 6H30's, include me for the time.
Axel