Finally completed my Dynahi, an on/off project (like some of them) for five years. Bought the set of boards from Samsie in December 2015, so I thought I'd just let him know that they eventually came of use!
Turned out to be a relatively uncomplicated build, except for a couple of resistors around the THAT340 with too many zeros, discovered by MLA.
Also a problem with the -30V side on one of the PSUs. Turned out to be a malfunctioning rectifier. A BC556 popped, but the supply worked once replaced. For a week or so, then the 556 popped again. After the third time I scratched my head, but some sparks from one of the surrounding caps told me it had taken some beating from the faulty rectifier. Replaced that and the DN2540 and now it has played without incidents for a couple of weeks.
Sounds very nice and has become my go-to-amp, with some competition from a KSA5 I took over from MLA recently. Spoiled for choice.