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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ECH81 End of forum contributions about this tube. This was an intermediate solution at times when transistors were not able to work on higher frequencies.

It would be useful to assess further examinations and tests; in particular, codes on the Philips group tubes and possibly physical examination of the construction. This is the nominal recommended screen bias.

Collection of Erich Dorninger A. The nominal conversion transconductance is specified as uS. If members have these types perhaps they could report the codes by mail so that we can get a better overall view.

Else its curves would break down far before V are reached. Perhaps they may react in a different way!? The ECH81 triode heptode was designed in for the role of frequency changer mixer in superhet receivers for AM reception. The anode circuit is tuned to enhance one of these signals, normally signal minus LO. He sent me a mixed variety of 11 tubes with all factory markings removed!!


With kind regards Lars-G. Collection of Ottmar Rollmann D. Addition 11 Dec Collection of Alexander Hofer A. You even can look up radio models with a certain tube line up. Thus the triode is mounted above the mixer on the common cathode tube. From the similarity of the curves it will be seen whether or not the thesis that ECH83 be a selected ECH81 is plausibel.

Collection of Jacob Roschy D.

ECH 81, Tube ECH81; Röhre ECH 81 ID, Triode-Heptode

Note how sudden and sharp it’s cutoff is with V at the lowest trace. Collection of Jean-Luc Potart F. Erb Analysis by original leaflets. Collection of Bekir Yurdakul F. According to our profound investigations and tests, the tubes ECH81 and ECH83 are equal – not even tested differently, but only stamped differently.

The table below shows the averaged results. Collection of Ottmar Rollmann D.

6I1P = ECH81 = 6AJ8 tube. Triode-heptode

The data for these measurements datashert This choice of grid requires a relatively wide p-p input for efficient mixing, but this is easily supplied by the independent triode oscillator. Having regard to Mr. The date of the second edition of the specification is May which shows that the usefulness of the ECH81 at low voltages was recognised at an early stage.


Hier arbeitet die ECH81 auch ganz “normal”. The very modest gm3 has hardly any effect when added to gm1 by driving both grids simultaneously as seen in the next photo. A fuller translation is HERE. Collection of Christian Schaufelberger CH.

According to our profound investigations and tests, the tubes ECH81 and ECH83 are equal – not even tested differently, but only stamped differently. Comparing the effect of the control grid G1 on plate current to the effect of the LO injection grid G3.