Classification of triode
a. Divided by material: silicon tube, germanium tube
b. According to the structure: NPN, PNP. as the picture shows:
c. According to function: switch tube, power tube, Darlington tube, photosensitive tube, etc.
d. According to power: small power tube, medium power tube, high power tube
e. According to the working frequency: low frequency tube, high frequency tube, over frequency tube
f. According to the structure and technology: alloy tube, flat tube
g. According to the installation method: plug-in transistor, patch transistor


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