If the regulator outputs are located exactly on the amplifier power inputs then the local MF & LF decoupling can be dispensed with.
You can design the two PCBs, PSU & Amplifier, to stack bottom face to bottom face to get as little as 2mm of lead length (a solid copper link) to make best use of very short lead lengths and very low added inductance.
I am not so sure the HF decoupling can be dispensed with, I suspect this is still required across the main output device, i.e. right across the output device, T2a Drain PIN to R4a GND PIN.
C7a is shown in the wrong position on the schematic. C7b may be near useless in it's present location.
Your proposition is like the attached schematic?
Attachments
I have used D1 I/V with IRF610 and pcm63 and were not pleased then modified with 2sk170
Same voltage +-30V, wich Idss & grade BL?
Your proposition is like the attached schematic?
If you do that you will probably have oscillation problems with the reg. You should keep the buffer in-line resistors if you will do that.
Same voltage +-30V, wich Idss & grade BL?
yes voltage Is same
search for a thread - fine tuned D1 convertor from a member Klaus around 2004
but I guess that Patrick Sen would be even better
BTW Is your pcm1704 a stock dac and not diy - have you compared stock output with D1 I/V
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