March 19, 2024
Matching PAIR Westinghouse 7591 Vacuum Tubes
Pricing & History
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Pair Westinghouse 7591 ***We will be selling even MORE of our collection of tubes over the coming week, including many power tubes and preamp tubes. Add us to your favorites and don’t miss out!*** Ratings for this tube: Test Data Va (plate volts) 300 Ia (plate mA) 60 Vg2 (screen volts) 300 Vg1 (grid bias) -10 Ra (load Resis) 3k Result 1 Result 2 Ik (cathode mA) -- 70.6 81 Ig2 (screen mA) 8 7.9 10 Gm (transco) 10,200 9600 10,000 Wout (Pwr Out) 11 12 12.8 Items in the 'Test Data' row are the parameters given in the manufacturer's data sheet. Items in the 'Results' row(s) are what was measured on the tube.Transconductance is listed exactly as read (not a “good/bad” or 0-120 scale that doesn’t relate to anything!), since we are working with original manufacturers data. The working parameters of most tubes can be +/-20% of the value listed on the data sheet right out of the box, tfore a tube can be considered as meeting new spec if it is within this range. I will only list a tube as “new” if it is or was in the original box, otherwise it will be sold “tested as new”. As for a minimum, when using a TV-7 for example, that seems to be around half of the data sheet transconductance. I will be rejecting any tube that has less than 50% of the data sheet transconductance. Furthermore, do note that new/NOS tubes’ characteristics will change
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