@tablejockey thanks for the tube rolling suggestions. It has gone on my list of things to try out. Current have tried out only the EL34 and the KT150.
As for aural embellishment, yes I do notice that when I put my hands behind my head, the clarity of the sound increases and the instruments become more distinct. Cupping your ears has an even greater impact. Being a relative newbie, is this to be avoided from an audiophile perspective, or is it "whatever works for you" ? I have also read that the best seating for listening to music should be without a head rest as headrests reflect sound. Not sure whether this is true as the majority of the feedback has been from those that have chairs with headrests!
On that score I understand that the Lobster Chair claims that it negates the feedback by absorbing the sound. Thus the question to the forum.
Thanks for the input @tablejockey