EF91 / 6AM6 / telefunken pentode tube nos tested*

Subject: EF91 / 6AM6 / telefunken pentode tube nos tested*

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DATASHEET -> http://www.mif.pg.gda.pl/homepages/frank/sheets/030/e/EF91.pdf
The parameters are measured at Ua = 250V, Ug2 = 250V, Ug1 = -2V
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