Any value/use for a vintage Krell krsp or KRS-1A?

Sorry to have to post this here but after looking all over the internet I can't seem to find any information about these two particular pieces of audio equipment. I know of Krell but most of my equipment is sub-$1000 and I'm sure when these were actually produced they were far beyond that.

I got a new condo and the previous owners left behind a lot of stuff, but I found these to be the most intriguing. There's one Krell krsp Power Supply and two Krell KRS-1A (preamps from what I've gathered?)

Is there any reason to keep these around?

I had an offer made of $800 but I'm really not willing to part with these without some frame of reference, anything, to let me know I'm getting a fair market value. After doing a little more research I think they may be worth a bit more.

Hope its okay to bump this, its been a really long time so I figured there are likely to be a whole new group of members that might have some insight.

I do, and realized I should have just subscribed to Audiogon to use their blue book in the first place. Apparently average used price is $1540 for a KRS-1A of which I have two, however only one of them has the power KRSP power supply. A full set of all four components just went for $3000 used in a short buy it now auction, but I won't underestimate the hassle of getting another KRPS or compatible outboard power supply, so I'm still entertaining any offers. Also as mentioned I don't have the cables but they're fairly simple to find for $30-60 a pair.