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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AC Yes but it is well within the context of the thread. And there is the rub. 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.

I think this equation will help. Rp is plate resistance of a tube section, triode, tetrode, pentode etc. Differences in Plate resistance? Cheers Steve Logged E55l2 Jr. I am not sure where you come up with the hours, except to say that covers power tubes as 6922, and is under manufacturer’s warranty. I would venture a guess that one of two reasons apply.

@ The Valve Museum

My concerns are the safety in case a catastrophic failure of the valve occurs, the less good performance are acceptable to me. Non-linearity is particularly profound close to the Volt 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 I have bought from him before.

The final limitation is the maximum allowable cathode current Ic. 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.


The datazheet structure between sections may be sheped slightly different. And yes I tried. What I discovered was for a tube whose sections MICROMHOS tested very close or the same that tube was the best candidate for achieving the best equal bias voltage for the plates of each section of the dual triode tube.

However, over the years Dataseet have not keep a time clock on tubes hours.

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.

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 ‘s anode dissipation limit is 1. How hard did the designer of the preamp drive the recommended tube? The limit of power that the can dissipate is known as the maximum anode dissipation and datsaheet appears on the datasheet. That’s why I asked is Ohms Datzsheet was at play.

In Europe, datashete i 6292, the equivalent for an is the E88CC. The cathode material may be slightly warped, thus the relationship between each cathode to grid and plate may be slightly different. These tubes were also bought as closely matched low noise tubes from well respected tube vendors. The grid wire also may not be placed exactly the same in relation to the cathode and plate. AC Yup, no worries here. That depends on the circuit specially if it is dc coupled and the components also but it is catasheet that this can happen.

Nope that’s not what I was attempting to ask. 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. E55l2 on 28 Jan ACHiPo on 15 Jan Manufacturer’s specs will be conservative.


I will say he is well known and respected. The filament itself may have hot spots, thus heating certain portions of the cathode more than other portions. So my question is–do s these are 7DJ8s need time to datasueet up, burn in, or otherwise sound right? By datqsheet way, Telefunken was known for gettinghours on their 12ax7 “family” under typical conditions.

What do you or those costumers mean with tube life? Simply reading a “specification” sheet of typical operation does not cover all aspects of operation, since spec sheets only cover very basic operating principles, not exhaustive by any means. Quote 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.

By using our site, you consent to the use of cookies by us. A few reasons why two sections inside of one envelope will cause the two sections to measure differently.

6922/ECC88/E88CC double triode

Note, not so for the VT mrk 3 amp, different circuitry. The region around Volt point is called cut-off point.

I guess I just did a poor job of asking what I was trying to find out. Maybe a bit better then the i say before but after h it is really a lot less then it was new.