March 15, 2020 0 Comments

Page 1. Page 2. Page 3. Page 4. ECH81 Datasheet PDF Download – Triode – Heptode, ECH81 data sheet. Class, Va, Vg2, Vg1, Ia, Ig2, Ra, S, Notes. Static, , , , , Triode section. Frequency changer, , , Triode section. Static, , , , ,

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Quantity of Models at Radiomuseum.

It is quite understandable, better performances at low supply voltages can be obtained by reducing the spacing of the electrodes in the first place! Only the ECC 86 tube utilizes different special technology …….

I include here some additional curves that explore the behaviour of G3, which is normally used for local oscillator LO injection. Believe it or believe it not, even with the supply voltage reduced to 3 V both tube types are still functional! Collection of Bekir Yurdakul F. Please ‘keep em coming! Investigating this apparent anomaly, the possibility of which I was not previously aware, took me to the discussion on your website.

You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. The full table of results is HERE. Also Trimmer des Zwischenkreises verdrehen: From these traces, it can be concluded: Collection of Bartosz Szwed GB.

Another ECH81 from the collection. Collection of Hermann Fleischanderl A. See this forum article here about that. However, further measurements will be done by Roy and Wolfgang in order to get additional information, although the thesis probably cannot be proved with any degree of datashfet.


ECH83 End of forum contributions about this tube. It would also be interesting to try an ECH81 in a low voltage car radio. Antique radios, Old Time Radios. Meyer Attachments comparation 19 KB. I have also asked Wolfgang Holtmann and Roy Johnson if they want to dig into this question methodically.

Collection of Michael Wenzel D. The selectable zoom factors are: Collection of Aldo Patriarca CH.

(PDF) ECH81 Datasheet download

If ever I am having doubts about my lack of knowledge in the area of radio, I simply read one of your articles.

I deleted all of them. There is no difference in construction! The following picture shows how a grid is positioned under the stereo-microscope to measure each grid position or the differences of distances between each wire. This is even more so, near 0V dxtasheet for either grid.

Es sieht “ganz normal” aus. Collection of Hans- Georg Tenz D.

Note the non-inverting voltage gain and negative transconductance from G3 to G2-G4. The pins are identical to ECH81 but that is all. Note how severe the attenuation is at low control grid G1 voltages at 0V. Some tubes were clearly used and the results were excluded from the averaged values. He will reveal his findings shortly. Collection JR Jacob Roschy.


ECH81 Datasheet PDF –

Which does rather beg the question; not merely the one raised in the forum as to why bother to introduce an “ECH83” at all, but beyond that, why take even more trouble to manufacture it as a distinct entity? In recent discussions with Jacob Roschyit has become apparent how popular and versatile the ECH81 tube is.

Even with a magnifier glass nothing worth to mention! One may speculate that the labelling in this particular case may be either due to the valve failing in some way to meet the necessary low-level performance required of an ECH83 although one might wonder whether the necessary level of testing would be cost-effective for a consumer item or more likely that the manufacturer was simply making up a shortfall in ECH81’s by “re-purposing” ECH83’s, and was content to do so in the knowledge that any difference in high-voltage performance would lie within normal tolerances.

Collection of Roland Biesler D. Text in other languages may differ. Collection of Georges Werts B. Collection of Oskar Elm D.

CV Different maximum ratings: They are fed to an Audio-Amplifier with speaker.