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PL81 Pinout
basing pinout
Note: pins 1, 6, and 7 are internal connections


PL81 Substitutes
Close or identical 21A6, CV5077, N152
Different rating or performance 21L40, PL81A

Warning: Substitutes are given as a guide only - please refer to original manufacturers data sheets to ensure that a substitute is safe and appropriate for your application.


PL81 Ratings
Vh Ih VaPeak PaMax Pg2Max
21.5 0.3 7,000 8 4.5


PL81 Application Data
Class Va Vg2 Ia Ig2
Line output 170 170 45.0 3.0


PL81 Data sheet links
National Valve Museum PL81: html
oldradio.qrz.ru PL81: MAZDA Valves & Picture Tubes Data, MK buizen handboek
Frank Philipse (Wildcat mirror - Jörg Jan Münter) PL81: PL81.pdf (104654 bytes), PL81.pdf (1217754 bytes), PL81.pdf (153324 bytes), PL81.pdf (4768163 bytes) (cs)  PL81A: PL81A.pdf (363669 bytes)

Bold designators are close or identical, Italic designators are different ratings, different pinouts or different filament voltages. Please see the substitutes at the top of the page for more details

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