Installing power transistors requires more than just soldering; heat management is the most important factor. Step 1: Surface Preparation
A bit more "headroom" than the D998/B778 without requiring major circuit adjustments. 3. The TIP Series: TIP35C / TIP36C
Monitor the temperature. If the transistors get hot within seconds while idling, turn it off—there is a bias issue or a short. Summary Table Equivalent (Best) Equivalent (Alternative) B778 (PNP) persamaan transistor d998 b778 install
40 MHz (making them quite "fast" for audio) Best Persamaan (Equivalents) for D998 and B778
Before looking for a replacement, you need to know what you are matching. The D998 and B778 are typically housed in a or TO-247 package. Type: D998 (NPN) / B778 (PNP) Collector-Emitter Voltage (Vce): 120V Collector Current (Ic): 10A Power Dissipation (Pc): 80W The TIP Series: TIP35C / TIP36C Monitor the temperature
Check for at the speaker terminals (it should be near 0V).
Very common, higher power handling, excellent for heavy bass. The D998 and B778 are typically housed in
Test: Use a multimeter on the "Continuity" setting to ensure the back of the transistor is NOT touching the metal heatsink directly. Step 3: Thermal Paste Application
Most D998/B778 setups use the heatsink as a common ground or a different voltage rail. You use a Mica insulator or a Silicone pad between the transistor and the heatsink.
This is the most common "upgrade." They are rated for and 150W (230V), making them much more robust than the original D998/B778.