tuned amplifier which work at 20HZ only

Hallo, i need a tuned amplifier which work at 20HZ only. how can i get that!!!!

Reply to
Faris Alahmad
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Buy or make? Buy: search Surplus market for Telecom Products

e.g. from Wandel & Goltermann, Ehningen/Germany. Or Siemens TF-Products. Or...

hth, Andreas

Reply to
TekMan

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