E.A.T. ECC88 COOL VALVE
Life | 10 000 hours |
Low interface resistance | |
Mechanical resistance | Shock and vibration resistant |
Base | Noval,Gold plate pins |
Heating | Indirect A.C. or D.C. ; parallel supply |
Heater voltage | Vf 6.3V |
Heater current | If 300mA |
Anode current | Ia 15mA |
Mutual conductance | S 12.5mA/V |
Equivalent noise resistance | Req 300Ω |
Noise factor (f = 200MHz) | F 4.6dB |
Anode voltage | Vao | Max. 550 V |
Anode voltage (Zero cathode current) | Va | Max. 400 V |
Anode voltage | Va | Max. 220 V |
Anode voltage (Max. anode dissipation 0,8 W) | Va | Max. 250 V |
Anode dissipation | Wa | Max. 1,5 W |
Anode dissipation ( Max. anode dissipation of section 1 plus section 2 = 2 W) |
Wa | Max. 1,8 W |
Grid dissipation | Wg | Max. 30 mW |
Grid voltage | -Vg | Max. 100 V |
Grid peak voltage (Max. pulse duration 200 μsec) (Max. duty factor 0,1) |
-Vgo | Max. 200 V |
Cathode | lk | Max. 20 mA |
lkp | Max. 100 mA | |
Vkf | Max. 150 V | |
Vkf | Max. 100 V | |
tbulb | Max. 170 °C | |
Rg | Max. 1 MΩ |
The E.A.T. ECC88 is a special quality double triode. The tube satisfies the specifications in accordance with MIL-E-1/1J168 (NAVY) from 18.6.1958.
Tight tolerances: In these tubes the tolerance of electrical ratings are reduced in comparision with standard tubes.
Vibration and shock proof: The tube withstands accelerationns of 2,5 g at 50Hz for lenghty periods and momentary shocks of 500g for short periods.
Cathode free from Interface: The cathode establishes no interface even in case where the heated tube is operated without plate current over lenghty periods.
Heather voltage: The average heather voltage should be 6,3 V.
Variations of the heather voltage exceeding the range of 6,0 V to 6,6 V will shorten the tube life. The tolerance of heather current (column II) should be taken into account.
Substitutes: E88CC, 6DJ8, 6922