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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The plots of the static transfer characteristic was used as reference.

Collection of Guido Pedrali Noy I. Collection of Bartosz Szwed GB. The third grid G3 retains a high dataasheet down to zero volts as can be seen in the right-most column. Collection JR Jacob Roschy.

CV Different maximum ratings: The pins are identical to ECH81 but that is all. Collection of Ottmar Rollmann D. However, the dch81 makes the valve operate with a gliding screen voltage.

We know already one thing: We don’t want “jumping to conclusions”.

(PDF) ECH81 Datasheet download

This indicates edh81 the ECH81 was deemed suitable for low voltage service. Note how severe the attenuation is at low control grid G1 voltages at 0V. Collection of Aldo Patriarca CH. Collection of Antonio Rabitti BR.

Normally, it is always highly recommended to pay full attention to the published maximum ratings! ECH81 End of forum contributions about this tube. Having regard to Mr. You will find thousands of tubes or valves with interesting links. Collection of Christian Schaufelberger CH. He will reveal his findings shortly.


The selectable zoom factors are: No – please wait. Collection of Peter Olasz H.

ECH81 Datasheet PDF –

Collection of Werner Wussow D. Collection of Tomasz Szczesniak PL. Collection of Christian Schaufelberger CH. Collection of Erich Dorninger A. According to our profound investigations and tests, the tubes ECH81 and ECH83 are equal – not even tested differently, but only stamped differently. Collection of Patrice Zeissloff F.

A sceptic buyer couldn’t believe this and fch81 seller refer to the this URL: Es sieht “ganz normal” aus. You will find thousands of tubes or valves with interesting links. Therefore I have written to Dietmar to dig into it before coming to the conclusion that only the pins are identical. Incidentally, the ‘R’ is definitely such, and not a partial ‘B’, ech8 the manufacturer is Mullard Mitcham.

Collection of Michael Wenzel D. This choice of grid requires a relatively wide p-p input for efficient mixing, but this is easily supplied by the independent triode oscillator.

Type ECH81 was first introduced in Thus the triode is mounted above the mixer on the common cathode tube. The data for these measurements are: Jacob has used it in many of his transmitter and receiver designs.


I include here some additional curves that explore the behaviour of G3, which is normally used for local oscillator LO injection. 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.

Please ‘keep em coming! This has raised some interesting points and a first quick test indicated very similar current and conductance values at low voltages also datasehet the ECH81 which gives credence to the intial article.