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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(PDF) ECH81 Datasheet download

I include here some additional curves that explore the behaviour of G3, which is normally used for local oscillator LO injection. We have to make a sacrifice! The conclusion is that measurements at high and low voltage show no significant difference between the two types. If members have these types perhaps they could report the codes by mail so that we can get a better overall view.

ECH 83, Tube ECH83; Röhre ECH 83 ID, Triode-Heptode

They were tested on an AVO characteristic meter at 3 voltages of screen and anode and at a grid voltage of He will reveal his findings shortly. This has been done for each tube received. Perhaps they may react in a different way!?

Also Trimmer des Zwischenkreises verdrehen: Es sieht “ganz normal” aus. Your brain is a scary thing indeed. An enhansed view of the outer grids. The triode is to be used as the local oscillator feeding the 13 Volts amplitude sine wave to the heptode mixer. Collection JR Jacob Roschy. Drehen wir uns im Kreise?? The third grid G3 retains a high impedance down to zero volts as can be seen in the right-most column.


ECH81 Datasheet

The full table of results is HERE. This indicates that the ECH81 was deemed suitable for low voltage service. A pre-test was done with reduced voltage and current, and with different valves, as shown here. So all the 3 might come up with facts here – but no more “cooks” please – or then via eMail to them or to me. Even with a magnifier glass nothing worth to mention!

Collection of Heinz Schmidt D. Note how severe the attenuation is at low control grid G1 voltages at 0V. He sent me a mixed variety of 11 tubes with all factory markings removed!! The way how to help here is given in my posts.

ECH81 @ The Valve Museum

This is even more so, near 0V bias for either grid. ECH81 End of forum contributions about this tube. Meyer Attachments comparation 19 KB. Collection of Werner Wussow D.

Collection of Klemens Rhode D. You will find thousands of tubes or valves with interesting links. The standing anode current and datashest mutual conductance for both the triode and the heptode sections were measured.


Collection of Peter Olasz H. They naturally show different values for a different usage volts anode. When the grid has been placed closer to cathode, the required results are achieved. Bearing in mind the maximum values given for the ECH81, a bench test set-up was easily created. Text in other languages may differ.

Note the non-inverting voltage gain and negative transconductance from G3 to G2-G4.

Collection of Alberto Zappacosta I. Collection of Jacob Roschy D.

Antique radios, Old Time Radios. The selectable zoom factors are: With kind regards Lars-G. At screen and anode voltages of 15 and the grid at zero voltage, the minimum acceptance currents are 18mA and 35mA respectively dztasheet the triode and heptode sections.

Before we present our results, I would like to show how I and what resulted. Das Radio war ausgeschaltet bei der Messung. Another ECH81 from the collection.

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