Bipolar transistor for final stage
| SANSUI | AU607 | 2SD188/A627 | NEC | |
| TRIO | KA-7300D | 2SC1116/A747 | Sanken | |
| PIONEER | M-25 | MP25/MN25 | Motrola | RET |
| TRIO | L-05M | 2SC2337/A1007 | EBT | |
| VICTOR | M7050 | 2SC2526/A1076 | ||
| KENWOOD | KA5010 | 2SC2921/A1215 | Sanken | LAPT |
| AUCENTIC | A10XX SPECIAL | 2SC2987/A1227 | NEC | |
| ACCUPHASE | P-550 | 2SC3263/A1294 | Sanken | |
| ACUUPHASE | P-1000 | 2SC5242/A1962 | Toshiba | |
| Kaneta method | 2N3055/MJ2955 | Motrola |