Not much info on Astatic echo boards, thought maybe i would help the next guy. First, i bought a radio used and it came as a bonus inside, but removed & replaced it with a RFx2 Turbo i had laying around. The range of delay doesnt even compare but maybe a trucker would want it, lol. I tested it on a 29 classic, wired it to the vol/on/off 13.8....blew 2 fuses, lol. Wired it to TR23 8v feed, works perfect, so power it to 8 volts, 73's