Orion HCCA 275R
 

what is this bad boy worth !!!

2 x 75W @ 4 ohms
2 x 150W @ 2 ohms
2 x 300W @ 1 ohm
2 x 600W @ ½ ohm
1 x 300W @ 4 ohms bridge
1 x 600W @ 2 ohms bridge
1 x 1200W @ 1 ohm bridge
Fuse: 4 x 40A
Dimensions: 25" x 10.25" x 2.25" (63.5cm x 26cm x 5.7cm)

its got all the plugs

It's an old amp and therefor it's worth what the buyer wants to pay for it. The price point is set by the nostalgic factor of the item and with this being an HCCA "r" type (which many feel is the weakest and therefor least desirable of the HCCA series) the price isn't going to be overly high.

I would put it in the $250-300 range if it is in nice condition.

Meh, take it to the Antiques Roadshow and see what they say.