Hi all, The LA-120 Decwriter that I got off Craigslist a couple of weeks ago has a dead H7150 power supply. Transistors Q1 and Q2 are open and shorted, respectively, and fusible resistor R4 is open. I'd guess that the failure of Q2 took out the other two parts. Q1 and Q2 are high voltage NPN power transistors in TO-3 cans, labeled __ 81 [ti logo] 41 (or maybe 4I, no matter, it's a date code) R3004 BRITAIN The DEC part number is 15-12782-00. The printset identifies them as "NPN 100W S1325 15". I can't find any substitutions online for either R3004 or S1325. (Or 15-12782-00 for that matter). There is a NOS pair for sale on eBay. So that's one option. Does anyone know what the modern equivalent(s) are? And what if you do, where did you find the reference? Thanks, Brian