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1T4 Pinout
basing pinout

 

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

 

1T4 Ratings
Vh Ih Cgk Cak Cga
1.4 0.05 3.6 7.5 0.01

 

1T4 Application Data
Class Va Vg2 Ia Ig2 Ra S
Pentode 90 67.5 3.5 1.4 500,000 0.9

 

1T4 Data sheet links
National Valve Museum 1T4: html
oldradio.qrz.ru 1T4: MK buizen handboek  DF91: MAZDA Valves & Picture Tubes Data
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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