Page 1. Page 2. Page 3. Page 4. Page 5. Page 6. Page 7. Page 8. The is described as being for use in cascode circuits and as a multivibrator and cathode follower in References: Datasheet & private correspondence. E88CC-TK TUBE DATA SHEET. Mechanical. Also known as the , the E88CC was originally targeted for test equipment and radar. The E88CC has.

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They are the special long life h versions of the normal range they make. At least people who care about good performance don’t like that. RV1 trim pot is for the input tube and RV3 is for the driver tube.


That depends on the circuit specially if it is dc coupled and datashdet components also but it is possible that this can happen. I hope I understood and properly answered your question s Jim.

You can read some reviews of one of my poor designs here.

So dtasheet is better not to use 6v but a little higher. I think this equation will help. It seems to support Brent Jesse’s and Kevin’s position that 7DJ8 tube life could be longer at the lower heater voltage, but FRM and E55’s contention that it’s not good practice are supported as well.

My preamp is a Sonic Frontiers Line One. As far as transconductance being reduced, reduced transconductance will increase the plate resistance, thus lowering the high frequency response. Maybe a bit better then the i say before but after h it is really a lot less then it was new.

6922/ECC88/E88CC double triode

For their ruggedness I use EH tubes for the input and driver tubes. For the test a Hickok a tube tester was used. Steve on 25 Jan One matched pair low noise per channel. In the circuit below is biased by applying a bias voltage to the grid datazheet R2. See my previous posts. So I have trouble believing your information. If we keep the plate current constant, altering the grid to cathode voltage will cause the plate to cathode voltage to change.


Gm is the change in plate current with a change in grid to cathode voltage,, with a constant plate to cathode voltage. This variance may be both horizontal and verticle.

Jim My apologies to datasheef OP for getting off topic. If the filament or heater is operated for long periods at reduced voltages, the effect is a reduction in emission, but no damage is generally done to the valve unless the cathode currents are sufficient to exhaust the “space charge. Whether the reduction in hfr will affect one’s perception will depend upon several factors. E55l2 on 25 Jan I will say he is well known and respected.

The input and driver tubes for each channel have to be biased. Steve Industry Participant Posts: They are maximum anode voltage Dataseet and Va b. Rp is plate resistance of a tube section, triode, tetrode, pentode etc. With a tetrode, pentode etc, the definitions are slightly different since more than one grid is present and draws current.

6922 Datasheet

Grid Bias Voltage In the circuit below is biased by applying a bias voltage to the grid via R2. Steve on 28 Jan Again, just for a triode.

Cheers Steve Logged jea48 Jr. Slightly different datssheet between each turn of wire. AC Yup, no worries here. I do in my preamps, but amplifiers, expecially the output tube, this is a consideration that needs to be addressed. Steve on 26 Jan Mu amplification factor is the change in plate to cathode voltage with a change in grid to cathode voltage,, with constant plate current. This is indication of non-linearity. The cathode material may be slightly warped, thus the relationship between each cathode to grid and plate may be slightly different.


With this tube the difference in imbalance voltage between the two plates was less datashee 1Vdc. The plate structure between sections may be sheped slightly different. Let me try again.

Section 1section 2 No way this tube could be biased in the VT50 as a driver tube let alone an input tube. Of course he is very careful about the sound of his reference system.

Designing a circuit to operate around the cut-off point is not advisable if a good linearity of an amplifier is required. Normally one thinks of resistance as being voltage divided by current equals resistance. At less filament voltage, the carbonates evaporate less, so grid contamination is less over time, a plus. For instance, no information is given on how the cathode actually works, space charge etc.

Could you please explain why? What do you or those costumers mean with tube life?

, et al Burn-in?

And there is the rub. Let’s keep it simple. The final limitation is the maximum allowable cathode current Ic.