Jerry, Thank you, so much. The parts are on their way. I really appreciate your assistance. Gary --- On Tue, 9/22/09, Jerry Akers <jerry_akers@xxxxxxxxx> wrote: From: Jerry Akers <jerry_akers@xxxxxxxxx> Subject: [analogorgans] Re: amplifier transistors To: analogorgans@xxxxxxxxxxxxx Date: Tuesday, September 22, 2009, 9:09 PM Gary, According to the Rodgers Tech website -- these are all equivalent parts: 2SD555 97SE101 2N4347 2N4348 And cross-reference to: GE-14 HEPS7000 SK3947/388 SK3036 Should be able to find something in this list -- let me know if you need further assistance... Best regards, Jerry Akers On Tue, Sep 22, 2009 at 7:35 PM, G L Jordan <jsbptech@xxxxxxxxx> wrote: Friends, I have a Columbia 100 with a defective power transistor PART # 97SE101 (7351) . Unfortunately all the web searches have failed to find a supplier with this part. Have any of you found a parts house for these older pieces? Gary