PS200C Signature amps use AC or DC Imputs for PS Audio 5.5 Preamp?

Audio Components Amplifiers
1

Hey Gang

I have been working on my near vintage dream system for about 12 years now .The one that I could not afford at the time.You know the drill.

2 each 200c signature amps SN#0710 and 0711, silver face,with warning labels, one was marked high ,one low. Not factory labels.The only difference I can see is one has black rack handles,the other has bronze rack handles? Question?, any reason to believe there is any internal differences and are these early or late in the production cycle?Units do have a little relay noise, but not enough to be an issue They are working great.

1 each PS Audio 5.5 Preamp with external power supply.Question?Would I use the AC or the DC inputs at the amp??? and why? Any simple way to test before hookup?

I am currently using a SoundStream C-1 preamp at the AC inputs with a GCPH phono and DPL3 /stage 4 dac, Things are working fine.

(I did have an issue with a Bryston preamp in the wrong input and I don’t want to repeat that, but I can’t recall ac/or dc inputs?

Thanks