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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Logged Steve Industry Participant Posts: And there is the datasheeg. Designing a circuit to operate around the cut-off point is not advisable if a good linearity of an amplifier is required. Next read note 7 And there is the rub. The cathode material may not be homogeneous across the nickel support. With a constant grid to cathode voltage, if we change the plate to cathode voltage, the plate current will change.

6922/ECC88/E88CC double triode

The final limitation is the maximum allowable cathode current Ic. Differences in Plate resistance? The grid wire also may not be placed exactly 69222 same in relation to the cathode and plate.

Gm is the change in plate current with a datawheet in grid to cathode voltage,, with a constant plate to cathode voltage. One matched pair low noise per channel.

TDSL Tube data []

My customer was reviewer Rich Weiner who wrote for Bound for Sound. For what it’s worth there is a tube life test that can be preformed on a used tube where the filament voltage is decreased in the same manner as I did in my test above. Maximum Allowable Anode Voltage and Anode Dissipation Moving datasueet the opposite direction along the load line, we use the harder and datasehet, until finally there is no voltage across it.


I take that as a given when dealing with a well known and well respected tube vendor. You can read some reviews of one of my poor designs here. The filament may not be perfectly spaced from the nickel sleeve, inside the cathode sleeve, causing hot spots etc, thus more emission on some areas of the cathode. For general public, consider evaporation of water cools the remaining container of water. Steve on 28 Jan Not knowing how it would turn out I tested several other used, that tested like near new, EH tubes in a Hickok a Mutual Conductance tube tester.

To know the tube life you have to measure the tube S, Ri, mu etcetera Simply perception, which in the end is all that counts. Please reread my last posts, as I have some 58 years actual experience 45 years since collegeincluding college lab and my own personal lab, and have explained some basic aspects of cathode operating principles.

At less filament voltage, the carbonates evaporate less, so grid contamination is less over time, a plus. Jim My apologies to the OP for getting off topic. I hope I understood and properly answered your question s Jim. Whether the reduction in hfr will affect one’s perception will depend upon several factors.

These tubes were also bought as closely matched low noise tubes from well respected tube vendors. Non-linearity is particularly profound close to the Volt point. Nope that’s not what I was attempting to ask. To know the tube life dqtasheet have to measure the tube S, Ri, mu etcetera Quote from: Moreover, datazheet of this vapour tends to deposit on the grid and give rise to what is known as grid emission when the grid itself emits electrons and draws current commonly known as negative grid current E55l2 on 28 Jan Not a lot better than before I replaced its 15 year old tubes.


@ The Valve Museum

However, over the years I have not keep a time clock on tubes hours. They are maximum anode voltage Va and Va b. Steve on 26 Jan My preamp is a Sonic Frontiers Line One. If the filament or cathode is operated continuously with a higher voltage than that recommended, some of the coating material is evaporated and permanently lost, thus reducing the life of the valve.

It’s been a few years since I listened to it critically with good tubes, but I don’t remember it sounding like this. You can’t set the two plate voltages of each tube individually.

However, I have seen hundreds, if not thousands of RCA and other brand 6dj8s that were under high stress that measured nice specs after years and thousands of hours of use. Mu amplification factor is the change in plate to cathode voltage with a change in grid to cathode voltage,, with constant plate current. IF, the manufacture’s recommended AC line voltage for the preamp is, say, Vac and the users house mains voltage is Vac what would the preamp’s power transformer heater secondary winding voltage measure?

The plate structure between sections may be sheped slightly different. I do in my preamps, but amplifiers, expecially the output tube, this is a consideration that needs to be addressed.

Please pardon me if I have crossed the line of civility. My concerns are the safety in case a catastrophic failure of the valve occurs, the less good performance are acceptable to me.