I tried an experiment with my Heritage on the Top Boost Channel and turned the bass and treble to zero and with the amp turned up a fraction more it was not too far away from the sound of the ef86 albeit a tad more bottom end which could be EQ'd out anyways. That's why I wondered if the new Boost switch which drives the 12AX7's harder might in effect match the ef86 ... would not know till I tried one, but I do like my Heritage !
The pictures on the website at Vox show the tag boards and layouts which are a bit like the Heritage to my memory. Wonder if Vox have moved the fuses for better accessibility and changed the voltages like Amanda suggested ?
I have had my Heritage 18 months now and apart from changing the valves its been reliable oh and a brass screw snapped on the back wooden panel.... cannot find a replacement screw anywhere even Vox do not supply them... Bu**er