NYDave One Bottle Preamp power supply questions

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Also, is this sufficient filtering on the DC going to the B+?
I think it is a bit too little ripple filtering, even if you include R13=10k and C6=22uF from the amplifier circuit.

I would suggest several RC filters depending on how many channels are connected to the PSU.

Capacitance is cheap these days, which means I would suggest an CRCRC with 220uF capacitors and 1K resistors for two channels. Then add R13 and C16, which also establish channel separation to minimize crosstalk and your B+ will be sufficient clean.

It also doesn't hurt to replace the first R with a choke of 5-10H and a power handling of more than 25mA. (for two channels)
 
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