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 current | lk | Max. 20 mA |
|
Cathode peak currnet (Max. pulse duration 200 μsec) |
lkp | Max. 100 mA |
| Voltage between cathode and heather | ||
| Cathode positive | Vkf | Max. 150 V |
| Cathode negative | Vkf | Max. 100 V |
| Bulb temperature (Absolute max.) | tbulb | Max. 170 °C |
| Grid resistor (Anode current < 5 mA) | 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
