In a message dated 11/15/2001 11:34:49 PM Pacific Standard Time, DOCVIDEO@xxxxxxxxxx writes: << They are made by Rohm Co. LTD both are same .. EXCEPT .. 2SA1633 VCEO= - 150, Ic= - 10, Pc= 100 2sc4278 VCEO= 150, Ic= 10, Pc= 10 Make sure when ordering to check for a classification code "letter" normally found at end or under main #....and include. This is for the hfe signal range....should have one of these "D", "E", "F" >> Yamaha and Jvc use these in their amps. I just pulled these same xisters out of a Yamaha junker and got a jvc amp running. It's called playing amplifier bingo, just do it for fun on the side. Larry ***************************************** Help make your TechAssist online repair tips database better! Submit your fixes here: http://www.circuitwork.com/techassist/tip/#tips ***************************************** To UNSUBSCRIBE write to: techassist-request@xxxxxxxxxxxxx with unsubscribe in the subject line.