Metal film resistor and high quality components.
Compare this with the preamp at 800-1000 AT LEAST € or more.
It is a bit colorful, but the sound is big, now with a nice personality.
Enormous gain of 80dB without breath.
Nothing to do with the preamp tube 100 or 500 €.
look at the bench trial on the net ...
For the price it's excellent.
I do not understand the previous negative opinion but I respect it!