Yup, that's old. 1995 and 1/4" jacks for speaker out, which worked fine with 300-watt amps. Still I'd recommend plugging the cabs in or out with the amp off and all lights extinguished. As long as any lights are on there is still DC current in the system. 1/4" speaker plugs always have the possibility of causing a short as they are removed or plugged in, so best to do that before the amp is turned on or after it has gone entirely dark.
That one puts out 175-Watts rms into 8Ω or 300-watts into 4Ω. It cannot handle a 2Ω load. That 1995 one is the model C of the WT300. I've attached a pdf copy of the appropriate owner's manual from 1998 for it if you want to get into particulars. It was a very nice sounding Eden amp and the forerunner to the WT400.
Hope that helps