Peavey CS800 c variant input drive question

[nosaj]

Got a couple of Peavey CS800 c variant power amps
What is a rough input voltage to drive the amp?

One side I can input 1.5v 1k tone into 4ohms and get a 38v clean sine on the Aside.
on the B side same voltage input i get a 26v clean sine.

Not to worried about the descrepancy as I'll figure that out but can't find any lit on recommended drive voltage for this amp.
Thanks,
nosaj

[Enzo]

Spec sheet for the CS800 wind tunnel version is 1.4v RMS in for rated output. I expect the C version to be similar.

[nosaj]

not sure it is a wind tunnel it is this one a 4u rack

[nosaj]

Here is the schematic I'm working from
Peavey-CS-800-C-Series-7-79-Schematic.pdf

[Enzo]

You already identified it as a C. "Wind tunnel" is a slang term for the later model with a big screened air vent on the front. I cited the wind tunnel because I didn't have a spec sheet for the C handy. They will be similar as the amps are equivalent.

[nosaj]

ok cool. This thing is a beast. This guys loves this model for some reason he says he can run them all day long maxxed and never overheat.

nosaj

[g1]

User manual says 1.4V for 400W @ 4 ohms like Enzo said.
Spec. in user manual attached.

[nosaj]

Thanks I hadn't seen the manual anywheres

nosaj

[mhuss]

We used a pair of these for years in my old bar band, but I found matched output transistors to be important. After the first pair or so of outputs blew, other would start to go as well, to the point where I used to bring spare TO-3s with me and field replace them when the amp blew up.