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mLine 9:
Line 9: − − ==References== − {{reflist}} − − − [[Category:Energy]] − [[Category:Electricity]] − [[Category:Radio]] − [[Category:Amateur Radio]]
cat cleaning and rm unused ref section
Amplifiers can be built using [[vacuum tube]]s or [[transistor]]s, or a combination of both.
Amplifiers can be built using [[vacuum tube]]s or [[transistor]]s, or a combination of both.
[[Category:Electrical Engineering]]
[[Category:Electrical Engineering]]
[[Category:Electronics]]
[[Category:Electronics]]