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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I have also asked Wolfgang Holtmann and Roy Johnson if they want to dig into this question methodically. With the added current limiting resistors, any malfunction should be discovered by this.
ECH81 Datasheet(PDF) – List of Unclassifed Manufacturers
Below are the isolated system parts from a tube. Thus the triode is mounted above the mixer on the common cathode tube. Collection of Datasheet Schmidt D. Hier arbeitet die ECH81 auch ganz “normal”. So all the 3 might come up with facts here – but no more “cooks” please – or then via eMail to them or to me. 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.
Collection of Jacob Roschy D. From the side, through the screen, can be seen two sizes of electrodes. Each column of the following 9 plots represents three source ecg81 driving the stepped grids: Incidentally, the ‘R’ is definitely such, and not a partial ‘B’, so the manufacturer is Mullard Mitcham.
There is no gas inside the ECH To be on the safe side, I opened both tubes to look for any differences in datashdet system itself. Collection of Emilio Focosi I.
Here the later stylised logo is used and the manufacture is not in the UK. They naturally show different values for a different usage volts anode. Another ECH81 from the collection. Konrad Birkner already suggested. A seller claims that the ECH83 tube is almost identical to the ECH81 despite the voltage difference in the anode circuit. The ECH81 triode heptode was designed in for the role of frequency changer mixer in superhet receivers for AM reception.
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. Nanu, doch alles o.
Note how sudden and sharp it’s cutoff is with V at the lowest trace. I deleted all of them. The conclusion is that measurements at high and low voltage show no significant difference between the two types. Even with a magnifier glass nothing worth to mention!
6I1P = ECH81 = 6AJ8 tube. Triode-heptode
Collection of Bekir Yurdakul F. Antique radios, Old Time Radios.
This choice of grid requires a relatively wide p-p input for efficient mixing, but this is easily supplied by the independent triode oscillator. We have to make a sacrifice! Comparing the effect of the control grid G1 on plate current to the effect of the LO injection grid G3. Looking into the screen the wire grids can be seen.
Erb Analysis by original leaflets. They are fed to an Audio-Amplifier with speaker. Collection of Ottmar Rollmann D. They have each been tested under the operating conditions recommended for each type of tube with a total of 8 measurements for each. Above the main assembly the cathode continues and a ecy81 grid can be seen. Collection of Ottmar Rollmann D.
Within the heptode, non linear operating causes the signals to interact to produce in the anode waveform the following major frequencies: Collection of Michael Wenzel D.
RTT Franzis As clearly was done. An independent measurement of the electrical and physical qualities was the goal. There is no difference in construction! Collection of Egon Strampe D. Some tubes were clearly used and the results were excluded from the averaged values.
A fuller translation is HERE.
However, in this case of doubts, I dare to take it a step further. Bearing in mind the maximum values given for the ECH81, a bench test set-up was easily created. So this curves are not directly comparatible to the curves in the first figure. Collection of Aires Gomes P.