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EC90 Pinout
basing pinout

 

EC90 Substitutes
Close or identical 6C4, CV133, CV852, L77

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.

 

EC90 Ratings
Vh Ih Cgk Cak Cga
6.3 0.15 1.8 1.3 1.6

 

EC90 Application Data
Va Vg1 Ia Ra S
250 -8.5 10.5 7,700 2.2

 

EC90 Data sheet links
Peter Millett 6C4: Acrobat PDF 254K
National Valve Museum 6C4: html, html2, html3
oldradio.qrz.ru 6C4: MK buizen handboek
Frank Philipse (Pocnet mirror - Patrik Schindler) 6C4: 6BY6.pdf (790979 bytes), 6C4.pdf (188330 bytes), 6C4.pdf (213770 bytes), 6C4.pdf (370609 bytes), 6C4.pdf (46301 bytes)  EC90: EC90.pdf (138825 bytes)  L77: L77.pdf (230994 bytes)
Frank Philipse (Wildcat mirror - Jörg Jan Münter) 6C4: 6BY6.pdf (790979 bytes), 6C4.pdf (188330 bytes), 6C4.pdf (213770 bytes), 6C4.pdf (370609 bytes), 6C4.pdf (46301 bytes)  EC90: EC90.pdf (138825 bytes)  L77: L77.pdf (230994 bytes)
TubeZone 6C4: pdf

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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