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12D4 Pinout
basing pinout
Note: pin 2 is an internal connection

 
12D4 Substitutes
Different rating or performance 12D4A
Different filament voltage 17D4, 25D4

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.

 
12D4 Ratings

No information available
12D4 Application Data

No information available
12D4 Data sheet links
Peter Millett 12D4: Acrobat PDF 92K  17D4: Acrobat PDF 26K
oldradio.qrz.ru 12D4: MK buizen handboek
Frank Philipse (Wildcat mirror - Jörg Jan Münter) 12D4: 12D4.pdf (97769 bytes), 6DA4.pdf (174021 bytes)  12D4A: 12D4A.pdf (80317 bytes)  17D4: 17AX4GT.pdf (118200 bytes), 17BH3A.pdf (67155 bytes), 17D4.pdf (145774 bytes)  17D4A: 17D4A.pdf (77915 bytes)  25D4: 25D4.pdf (77309 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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