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EL503 Pinout
basing pinout
Note: Pin 8 is an internal connection

 
EL503 Substitutes
Close or identical 8278

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.

 
EL503 Ratings
Vh
V		 Ih
A		 VaMax
V		 PaMax
W		 Pg2Max
W
6.3 1.2 300 25.0 4.0

 
EL503 Application Data
Class Va
V		 Vg2
V		 Vg1
V		 Ia
mA		 Ig2
mA		 Ra
Ω		 S
mA/V		 Rk
Ω		 Zout
Ω		 Pout
W
A S/E 250 250 -12.5 100.0 8.0 7,300 24.0
AB1 P/P 265 265 200.0 16.0 56 2,400 40.0

 
EL503 Data sheet links
oldradio.qrz.ru EL503: MK buizen handboek
Frank Philipse (Wildcat mirror - Jörg Jan Münter) 8278: 8278.pdf (72018 bytes)  EL503: EL503.pdf (127998 bytes) (fr), EL503.pdf (146503 bytes), EL503.pdf (385001 bytes) (fr)

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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