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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:electronics]]
==References==
{{reflist}}
[[Category:Energy]]
[[Category:Electrical Engineering]]
[[Category:Electricity]]
[[Category:Electronics]]
[[Category:Radio]]
[[Category:Amateur Radio]]