sri for BW, I find myself with time now to finish up several amp projects My DX chasing AL82 has blown bias it shows the zener diode as 301-2971 DIODE, ZENER, 7.5V, 1N2971A, DO-4,10W, STUD MOUNT $10.00 Before I rush out and buy it, are there better options? and would higher wattage unit help? 73 W5AJ Robert Midland, Texas