Peavey amp line level/pre question

It's a power amp with the graphic EQ built in. Needs to see a line-level signal to operate correctly. If it's a typical guitar FX fuzz, the stomp box is made to work with instrument level signals for both the input and output. He'll need a real preamp of some sort.

 

You can try but doubtful any battery pedal puts out the full 1.4v.

 

The amp being used in the video is not the same device as illustrated in the OP's pic; one can see that the front panel layout is different. Regardless, a regular bass guitar output isn't hot enough to drive a line input directly. The PV amp's line input probably doesn't need to see a full 1.4 volts to provide maximum output, but a regular stomp box isn't likely to have enough gain to drive it directly either. Whether that particular pedal has enough gain I can't say, but it certainly wouldn't hurt anything to try it.

That amp isn't all that powerful; it seems likely that you'll find the amp's output fairly anemic with just an 8-ohm load, given that it's full 130-watt rating is for a 4-ohm load. It will be half that into 8 ohms, so a walloping 65 watts. If the cabs really are 16-ohm boxes, and both cabs are plugged in, that 65 watts will be spread out over 8 drivers, so each driver will be dissipating about 8 watts. Rockin'? Not so much.

 

Peavey did it by the book so 1.4v standard to full gain is to be expected. Newer Peavey models can switch to .7v for a happier pedal driving experience.

 

One manual I looked at online stated that a 260 booster amp needs 4.2 volts to drive to full output. That can't be right, can it? That particular amp had an 'aux' in that an additional 10dB of input gain, but otherwise looked identical to the pic in the OP. https://peavey.com/manuals/80361021.pdf

 

Yeah, that's right. The particular model your link refers to can handle speaker level signals (up to 20v/rms) as a "line" level input. It can also, simultaneously, accept a mic plugged directly into the aux input and deliver equivalent gain to drive the amp section.