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DF91 Pinout
basing pinout

 

DF91 Substitutes
Close or identical 1T4, CV1971, CV785, VT173

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.

 

DF91 Ratings
Vh Ih Cgk Cak Cga
1.4 0.05 3.6 7.5 0.01

 

DF91 Application Data
Class Va Vg2 Ia Ig2 Ra S
Pentode 90 67.5 3.5 1.4 500,000 0.9

 

DF91 Data sheet links
National Valve Museum DF91: html
oldradio.qrz.ru DF91: MAZDA Valves & Picture Tubes Data, MK buizen handboek
Frank Philipse (Pocnet mirror - Patrik Schindler) 1T4: 1T4.pdf (150099 bytes), 1T4.pdf (275717 bytes), 1T4.pdf (318621 bytes) (fr), 1T4.pdf (98806 bytes)  DF91: DF91.pdf (329293 bytes), DF91.pdf (468499 bytes), DF91.pdf (78853 bytes), DF91.pdf (93443 bytes)
Frank Philipse (Wildcat mirror - Jörg Jan Münter) 1T4: 1T4.pdf (150099 bytes), 1T4.pdf (275717 bytes), 1T4.pdf (318621 bytes) (fr), 1T4.pdf (98806 bytes)  DF91: DF91.pdf (329293 bytes), DF91.pdf (468499 bytes), DF91.pdf (78853 bytes), DF91.pdf (93443 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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