5 solid state tube replacement rectifiers 2 matched NIB Sarkes-Tarzian S5251/1N2389, 1600 PRV, 600ma OK for all 5xx rectifier tubes except 5R4 2 matched Motorola/SES 1N1239, 2800 PRV, 500ma OK for all 5xx including 5R4 1 each Semicon.Inc 1N1239, 2800 PRV, 500ma OK for all 5xx including 5R4 All 5 for $39 pp 48 73 John b