I brought back into service an old Gray Electronics amp, looks like someone hooked it up backwards and burned traces off the board and then cannibalized the switches, but its fixed now. I cannot find any information on it, would like to know how much current this thing will draw on max power. I know it is late 70s early 80s vintage, switch for low-med-hi-max, rcvr amp, ssb-am/fm. It sounds awesome on SSB, I suspect its class-AB biased. Was told not to hook it to anything more than 5 watts key. It uses 4 MRF492 - 231 I really just want to know max power I can drive this thing, and how much current it will draw. I like it and dont want burn it up.