Re: MJE720 transistor search

[Tinco Brouwer]

H.C. Croon wrote: Hello Group, I have exausted all of my extensive resources in search for a Motorola MJE720 transistor in a TO-126 case for a 400 watt per channel BGW 750C power amp. I am having absolutely NO luck finding any info on it. Does ANYONE have a source or as a LAST resort a legitimate sub. It is functioning as the bias transistor with 300 volt MJE340 and MJE350 complimentary devices as pre-drivers in the same case style which I had no trouble obtaining data for. Any info would be appreciated. In an old transistor database I find: MJE 720 NPN VCEmax=40V VCBmax=40V VEBmax=5V ICmax =1.5A Ptot 2W (is this an error in the database? The first replacement is a 20W type) hfe>=40 Hfe bias=0.15A (so hFE=10 ?; can we trust this data?) first replacement BD169 second replacement 2N4923 /-------\ connection [ E C B ] regards, Harry The ON semiconductor site suggests as direct replacement the 2N4921 http://www.onsemi.com/site/products/summary/0,4450,2N4921,00.html you can even ask for a sample.. Regards, Tinco Brouwer Afd. Elektronica Biologie Vrije Universiteit Amsterdam