DYNACO EARLY REVISION ST-120 PC-14 COMPLETE QUICK REPAIR KIT. THIS KIT CONTAINS EVERY TRANSISTOR AND DIODE ON ONE CHANNEL OF THE PC-14 DRIVER BOARD PLUS ASSOCIATED OUTPUT TRANSISTORS. (D1 THRU D3 , AND Q1 THRU Q6 --- 9 SEMICONDUCTORS IN ALL)   INPUT AND OUTPUT DEVICES ARE SCREENED FOR NOISE AND/OR GAIN. KIT COMES WITH SCHEMATIC, INSTRUCTIONS,  AND PC-14 PICTORIAL SHOWING DEVICE LOCATION AND EBC ORIENTATION. DUE TO REVISION CHANGES IN THE ST-120 DESIGN,  Q3 AND Q4 ARE TO-39 PACKAGE (ROUND CAN) TRANSISTORS IN THIS LISTING AS OPPOSED TO TIP PACKAGE (FLAT WITH HOLE)  WHICH PERTAINS TO LATER REVISIONS.  IF YOU WANT LATER TIP MOD REVISION PARTS, THE KIT IS  AVAILABLE  UNDER A DIFFERENT LISTING AT MY EBAY STORE.