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For audio quality, buy matched pairs or measure hFE. Original parts had hFE range 40–140. Modern equivalents (e.g., 2SC5200) are typically 55–160. Close matching between NPN and PNP reduces distortion.
| NPN Equivalent | PNP Equivalent | Notes | | :--- | :--- | :--- | | | 2SA1943 | Very popular; slightly lower Vceo (140V vs 160V) but acceptable for most amps. Higher ft (30 MHz), 150W, 15A. Toshiba. | | MJL4281A | MJL4302A | Superior performance; 230V, 230W, 15A. Requires checking if original circuit voltage is <160V. Onsemi. | | NJW0281G | NJW0302G | Direct upgrade; 250V, 150W, 15A. Excellent SOA. Onsemi. | | 2SC3858 | 2SA1494 | Japanese standard; 200V, 200W, 17A. Slightly larger but very robust. Sanken. | Persamaan Transistor D998 B778
Pastikan transistor pengganti memiliki nilai Vceo (tegangan) dan Ic (arus) yang sama atau lebih besar dari aslinya untuk menghindari kerusakan akibat beban berlebih. For audio quality, buy matched pairs or measure hFE
Transistor D998 B778 memiliki beberapa fungsi, antara lain: Close matching between NPN and PNP reduces distortion
Lepaskan kedua transistor final (driver dan final) dari heatsink. Bersihkan pasta thermal lama.