. Astron`s "no-frills" power supply, model RS-20A...Not fancy, just gets the job done. . 13.8 vdc @ 20 amp...50% duty cycle. . Excellent condition. . $49 plus shipping costs (it`s heavy). Money order, or your personal check. . Please use my QRZ-listed email address with any comments, questions, and for purchase...Thanks. . 73...Ray...W3ESE .