@plaw
i have not personally tried old stock mullard 12AX7’s but i have plenty of experience with old, real Mullard 12AU7 and 6DJ8 equivalents, for small signal tubes (not power tubes)
if the sound signature holds true to 12AX7’s you are asking about, yes, they are more rounded sounding, mid bass looser and fatter, highs rolled off... a very ’tube like’ tube, if you follow my drift
sometimes too much of a good thing, depending on the circuit they are used in, but very helpful when a user is trying to tone down harshness or stridency
philips ecgs are newer tubes (made in late 70’s and early 80’s) they are more transparent and extended, less midrange heavy
i have not personally tried old stock mullard 12AX7’s but i have plenty of experience with old, real Mullard 12AU7 and 6DJ8 equivalents, for small signal tubes (not power tubes)
if the sound signature holds true to 12AX7’s you are asking about, yes, they are more rounded sounding, mid bass looser and fatter, highs rolled off... a very ’tube like’ tube, if you follow my drift
sometimes too much of a good thing, depending on the circuit they are used in, but very helpful when a user is trying to tone down harshness or stridency
philips ecgs are newer tubes (made in late 70’s and early 80’s) they are more transparent and extended, less midrange heavy