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 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. This was an intermediate solution at times when transistors were not able to work on higher frequencies.

ECH81 Datasheet

Investigating this apparent anomaly, the possibility of which I was not previously aware, took me to the discussion on your website. Text in other languages may differ. The last question being a pragmatical approach. Wire diameters and thicknesses have been tested with a micrometer of a resolution of 0.

ECH81 @ The Valve Museum

If ever I am having doubts about my lack of knowledge in the area of radio, I simply read one of your articles. Type ECH81 was first introduced in Collection of Ralf Meinke D. The full table of results is HERE. Collection of Jacky Parmentier F. Collection of Alexander Hofer A. The following results were obtained for 4 of each dahasheet.


Collection of Jacob Roschy D. The plots of the static transfer characteristic was used as reference.

Collection of Ottmar Rollmann D. Some tubes were clearly used and the results were excluded from the averaged values.

(PDF) ECH81 Datasheet download

Collection of Franco Antolini I. Erb Analysis by original leaflets. This leaves G1 independently available for RF input with remote cutoff.

This has been done for each tube received. The anode circuit is tuned to enhance one of these signals, normally signal minus LO. Test voltage was 25 V. Note how severe the attenuation is at low control grid G1 voltages at 0V.

In recent discussions with Jacob Roschyit has become apparent how popular and versatile the ECH81 tube is. A plot of all measurements is shown HERE eech81 a logarithmic scale.

ECH81 Datasheet PDF –

eatasheet At screen and anode voltages of 15 and the grid at zero voltage, the minimum acceptance currents are 18mA and 35mA respectively for the triode and heptode sections. Collection of Bekir Yurdakul F. Collection of Klemens Rhode D.

Also, Radio wieder einschalten und Eingangskreise wobbeln. Collection of Ottmar Rollmann D. The nominal conversion transconductance is specified as uS. The minutes datxsheet measuring a datasneet is shown in the picture below. 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 datasjeet 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.


Also Trimmer des Zwischenkreises verdrehen: There is no gas inside the ECH This choice of grid requires a relatively wide p-p input for efficient mixing, but this is easily supplied by the independent triode oscillator.

Perhaps they may react in a different way!? They naturally show different values for a different usage volts anode.

Collection of Antonio Rabitti BR. You reach this sch81 or valve page from a search after clicking the “tubes” tab or by clicking a tube on a radio model page.

In the table below you find the relevant distances between electrodes of the heptode systems of all 13 tubes. It would be useful darasheet assess further examinations and tests; in particular, codes on the Philips group tubes and possibly physical examination of the construction.