Hey-hey!!!, before I started building amps which wanted lower gain linestages I was happy with the 5687. I found a general trend that higher voltage combined with lower current made it sound a bit crisper. Perhaps in a thinner sort of way. It is a fairly subtle change, but fairly easy to spot.
Shoot for 80% of B+ and 3 mA. Keep in mind that an L-C supply is going to react differently at loads below critical current. Proceed with caution and a multi-meter, no? cheers, Douglas
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