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17D4-A Pinout
basing pinout
Note: pin 2 is an internal connection

 
17D4-A Substitutes
Different rating or performance 17D4
Different filament voltage 12D4A

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.

 
17D4-A Ratings

No information available
17D4-A Application Data

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