The purpose of the servo loop is to remove the exit capacitor in a balanced design. Is there such a design from Nelson Pass?
Curious? Google "servo loop james bongiorno"
Curious? Google "servo loop james bongiorno"
No Pass Labs amps have servos. DC coupled and stay within mV’s.
Some Threshold product had servos.
Some Threshold product had servos.
Then do all the Pass Labs amps have unity gain at DC,
after any input coupling capacitor? Probably none actually amplify DC.
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Current amps are full gain at DC no caps. The .5 had input caps. The integrated amps have a cap on the pre to the power section.
The HPA-1 does have a servo. No power amps do.
Would not every balanced design run without an exit-cap?
"Capacitors in the signal path" are no problem regarding sound. Use little ones, NO big MKP or other big stuff.
The 1. advantage of balanced designs is the outcrossing of psu-"fluctuations": use ONE psu; do not add psu-"fluktuations" per add psu's;-)
The big problem are many psu's and many parts and many gain-stages and a lot of feedback-loops ... and complementary-transes-designs;-)
And poor sources and (multiway-)speakers;-)
PassDiy
Ralf Metzger - Aleph X
High Power Aleph-X Monoblock – Garbz Electronics
ALEPH-X - Pass Labs Clone Class-A amplifier PCB & schematic
"Capacitors in the signal path" are no problem regarding sound. Use little ones, NO big MKP or other big stuff.
The 1. advantage of balanced designs is the outcrossing of psu-"fluctuations": use ONE psu; do not add psu-"fluktuations" per add psu's;-)
The big problem are many psu's and many parts and many gain-stages and a lot of feedback-loops ... and complementary-transes-designs;-)
And poor sources and (multiway-)speakers;-)
PassDiy
Ralf Metzger - Aleph X
High Power Aleph-X Monoblock – Garbz Electronics
ALEPH-X - Pass Labs Clone Class-A amplifier PCB & schematic
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