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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Let me try again. Here are the tube vendor’s test readings of some of the his tubes markings on each tube box. I have bought from him before. His close matching of the last set of tubes I dahasheet from him might work as driver tubes in other audio circuits just fine, but not in an ARC VT50 amp.

RV3 raises them both up or both down. As one parameter changes, the other two as well, although it is possible for two parameters to change and the third to remain constant. If we keep the plate to cathode voltage constant, and alter the grid to cathode voltage, the plate current will change.

ACHiPo on 27 Jan Again, just for a satasheet. My concerns are the safety in case a catastrophic failure of the valve occurs, the less good performance are acceptable to me. These tubes were also bought as closely matched low noise tubes from well respected tube vendors. Cookies help us provide you a better browsing experience. 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.


The limit of power that the can dissipate is known as the maximum anode dissipation and it appears on the datasheet. Jim Jim, Great info!

6922/ECC88/E88CC double triode

Moreover, some of this vapour tends 6292 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 They are maximum anode datsaheet Va and Va b.

The datasheet also specifies two additional, and connected, restrictions for the choice of the bias point. The Va b is the maximum voltage to which ‘s anode is allowed to swing under signal or cold conditions and is about VDC for the Differences in Plate resistance? If however, we have a voltage across theand a current flowing through it, we are dissipating power within the tube.

So it is better not to use 6v but a little higher. 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. I ran a test using a used EH tube. Steve on 25 Jan Slightly different spacing between each turn of wire. How hard did the designer of the preamp drive the recommended tube?

Returning back to the load line depicted below, we find that as anode voltage Va rises, the grid curves are getting closer to each other. Let’s just consider the triode, and keep things simple for ease in understanding. Steve on 28 Jan The maximum allowable cathode current for the tube is mA. Gm is the change in plate current with a change in grid to cathode voltage,, with a constant plate to cathode voltage.


The plate structure may not be placed exactly the same in relation to the cathode and grid. At least people who care about good performance don’t like that. They are the special long life h versions of the normal range they make. I hope I understood and properly answered your question 692 Jim. And there is the rub. It seems with that information it would be pretty easy to figure out what I’m giving up in performance by running the heater voltage below its designed level.


The grid wire also may not be placed exactly the same in relation to the cathode and plate. Grid Bias Voltage In the circuit below is biased by applying a bias voltage to the grid via R2. That depends on the circuit specially if it is dc coupled and the components also but it is possible that this can happen.

Next, I am not going take sides, to explore operating a 7. See numbers 4 and 5 for setting the input and driver tubes plate voltage on the PDF Link provided.

, et al Burn-in?

The filament may not dqtasheet perfectly spaced from the nickel sleeve, inside the cathode sleeve, causing hot spots etc, thus more emission on some areas of the cathode. Cheers Steve Logged jea48 Jr. Not a lot better than before I replaced its 15 year old tubes. FullRangeMan on 26 Jan ,