Amazon.com: High Power Amplifier Transistor Matched Audio Silicon Transistor for Model 2SA1943 2SC5200, 5 Pairs : Electronics
2 in 1 Transistor Tester&Digital Oscilloscope,2.4inch Professional LED backlight Display Screen Mini Handheld Digital Oscilloscope,Hidden Support frame, 200kHz Bandwidth&2.5MS/s Sampling Rate(DSO-TC2): Amazon.com: Industrial & Scientific