A real EL519/PL519 have higher allowed anode dissipation, (35W compared to 30W) and higher allowed cathode peak current, (1500mA compared to 1200mA) than a EL509/PL509.
See here http://www.mif.pg.gda.pl/homepages/frank/sheets/010/p/PL519.pdf
and here http://www.mif.pg.gda.pl/homepages/frank/sheets/010/p/PL509.pdf
Regards Hans
See here http://www.mif.pg.gda.pl/homepages/frank/sheets/010/p/PL519.pdf
and here http://www.mif.pg.gda.pl/homepages/frank/sheets/010/p/PL509.pdf
Regards Hans
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