T+A DAC 8 DSDT+A DAC 8 DSD Different ladder resistors they are Melf not Visay. But it is a full discrete preamp output stage with more than enough output.
We have again further improved the unit’s outstanding pre-amplifier, and incorporated a volume control of fully analogue construction based on High-End Melf resistors. The “State of the Art” output stage is of fully symmetrical design and discrete construction. Its impedance is very low, and it is equipped with symmetrical(XLR) and asymmetrical (RCA) outputs. These features make the DAC 8 DSD more than just a High-End converter: it is also a High-End pre-amplifier of supreme quality.
Perla Audio MAESTRO PRE-AMPLIFIER
It doesn't say anything about the Perla Audio Maestro being anything but a passive preamp.
It uses power, but that's just for remote receiver and volume control movement duties, it's still a passive looking at the website.
https://www.perlaaudio.com/pre-amplifiers
Cheers George