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12X4 Pinout
basing pinout

 

12X4 Substitutes
Different filament voltage 6X4, CV493, CV8203, CV8223, CV8237, EZ90, U78

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.

 

12X4 Ratings
Vh Ih
12.6 0.3

 

12X4 Application Data
RMSin Irect Notes
360-0-360 90 Ia pk = 245mA

 

12X4 Data sheet links
Peter Millett 12X4: Acrobat PDF 25K  6X4: Acrobat PDF 499K
National Valve Museum 6X4: html2  U78: html
oldradio.qrz.ru 12X4: MK buizen handboek
Frank Philipse 12X4: .gif file, 137/6/6X4.pdf  6063: 062/e/E90Z.pdf  6X4: Acrobat PDF  U78: 126/u/U78.pdf
Frank Philipse (Pocnet mirror - Patrik Schindler) 12X4: 12W6GT.pdf (35806 bytes), 12X4.pdf (148549 bytes), 12X4.pdf (56806 bytes), 6V6.pdf (565224 bytes), 6X4.pdf (376421 bytes)  6063: 6063.pdf (60980 bytes)  6X4: 6X4.pdf (145671 bytes), 6X4.pdf (47067 bytes), 6X4.pdf (486681 bytes), 6X4.pdf (551501 bytes)  U78: U78.pdf (118422 bytes)
Frank Philipse (Wildcat mirror - Jörg Jan Münter) 12X4: 12W6GT.pdf (35806 bytes), 12X4.pdf (148549 bytes), 12X4.pdf (56806 bytes), 6V6.pdf (565224 bytes), 6X4.pdf (376421 bytes)  6063: 6063.pdf (60980 bytes)  6X4: 6X4.pdf (145671 bytes), 6X4.pdf (47067 bytes), 6X4.pdf (486681 bytes), 6X4.pdf (551501 bytes)  U78: U78.pdf (118422 bytes)
TubeZone 6X4: pdf
Virtual Valve Museum 6X4: HTML page

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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