The amp pictured is mine, I considered both a change in the R1 resistor and a film cap as the last cap in the power supply. Would it be worth the trouble? Not to me, what is there is fine, for power supply, if you have problems then you should go with the DC upgrade or bypass with a nice film cap (and I didn't want to bother PB anymore). For the resistor, I didn't think the BH supplied one needed upgrading. YMMV, etc, etc.
Do what you like...
Alonzo
Gameroom:>Mainline to HD820, SR45 to Pipette
>BeePree Kaiju & SII to Altec 19 knockoffs
Office:>BH Stat amp to Koss 95x, T20 SET to JBL 4309s
Den:> MorePlay 845 SET to Altec Valencia's