7591A Sylvania NOS USA Power Tube Matched Pair
Matched pair of New Old Stock Sylvania 7591A /7591 power tubes.
One pair available.
Matched for mutual transconductance on Hickok 6000A tube tester.
Tested in1965 Ampeg Gemini I.
7591 vs/ 7591A? As far as your old Ampeg goes it makes no difference but the "A" meant it was supposed to handle a few more volts (450vdc on the plates). Use either version with confidence.
Most Ampeg are cathode biased so jut plug and play on these.
The exceptions are the Gemini II, Gemini IV so check your bias before using.
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