25DK3

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• General Electric Product Information datasheet, page 3-73. T-9 glass envelope, Base E9-89 (Button 9-Pin), Top Cap C1-2 (skirted miniature). Basing diagram EIA 9SG.
• Designed specifically for color TV applications requiring higher PIV than standard B&W damper diodes.
• Pin 1 is heater insulation coil. Pin 6 and Pin 8 are internal connections — do not use as tie points. Pin 9 may be used as tie point for components at heater potential.
• Heater-cathode voltage: heater positive max 100V DC / 300V total DC and peak; heater negative max 900V DC / 6500V total DC and peak.
• Maximum bulb temperature 220 degrees C (measured by infrared thermometer).
• Average tube voltage drop: 16V at 400 mA, 25V at 800 mA (explicitly stated under 'Average Characteristics' in the GE Product Information sheet, page 2, 3-73). The 16V value at the rated 400 mA DC plate current is used as the canonical Vdrop.
• Interelectrode capacitances (without external shield): cathode-to-plate-and-heater 22 pF, plate-to-cathode-and-heater 13.6 pF, heater-to-cathode 1.10 pF.
• Heater current 0.45 +/- 0.03 A. Heater warm-up time approximately 11 seconds.

• https://frank.yueksel.org/sheets/135/2/25DK3.pdf