The ECC88 is a VHF double triode with separate cathodes. The ECC88 was is 48 mm tall. References: Datasheet &. Type ECC88 was first introduced in ECC88 page sheet date. 1. 1. 2. 2. 3. 3. 4. A . 5. B. 6. C. 7. FP. The 6DJ8/ECC88 is a frame grid sharp cut-off twin triode with separate cathodes designed for use in cascode circuits, RF and IF amplifiers, mixer and phase in-.

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Original old blue boxes. Only do these measurements inside your amplifier, when you have experience with this. Perfect quality, good boxes. However they bias not as trhey shouls in all circuits, and have slightly lower gain.

When it writes on there “ECC88, 1 ” as you see on the picture here this means this tube was made in Germany, indicated by the number “1”. So you can see it yourself. This tube excist as normal grid tube and as frame grid tube. Also read here Uh-k. Used tubes of this type generally have more hum and noise.

Is your ECC88 microphonic? These appear like that. Printing is fainted, but unburned, very white still.

JAN Testing is a military proces for lot qualification, which makes sure that weak production series will not pass as a whole. The ones we sell, are “EB”, also when not specified like this, it’s what they are. Even with top-name amplifier manufacturers we see the same old errors, resulting from arrogancy, like not reading a datasheet. For the rest every little detail is identical. It is not much but we have to say it.


Clear white print like new, from spare equipment.

Used, but look and test like new. They test all at 15mA, with grid voltage variation of less than 0,2 Volt!! This is a much improverd version of ECC88 made, with higher voltage capabilities, higher plate dissipagtion, and better in many many ways.

ECC88 Datasheet PDF

They were supplied with first class datasgeet by the manufacturers, and the country of origin is always printed on the tubes. Mind you they draw twice the heater current. Lucky on internet auction sites. These are the later technology, and also a technology only very few could make. You can order any pair you like, as long as we have it available. Left tube on the picture. Number “2” would mean outside Germany. Some tubes from equipment are sometimes actually never used. Frame grid wires can be as thin as 10um, which is technologically speaking a masterpiece of fine mechanics.

Eech test must be in between following limits: This is probably the best ECC88 ever made. To give you an idea, the size of a large bacteria is 5um. So with them, what you pay is what you get.


What is best, we had a small lot, and we have been able to select them all in perfectly balanced and matched ratasheet. So all four systems of this pair are the same.

ECC88 Datasheet

This pair has printed on the glass: These tubes are boxed and branded “National” USA. This is not normal for E88CC, test values can vary widely, datasheef you have to take them as is. Done so in when these were made, but JAN testing is still used for semiconductors as well. Please note with some not with all the print text has suffered somewhat from storage. High Quality tubes from the Prague factory Code Now of course manufacturers could still sell such tubes on the commercial market, but the military refused to take those.

Meaning they are EI tubes. TESLA is even a frame grid tube! Made on Philips machines.

The 6DJ8 / ECC88 / Tube

These have lower noise, and less distortion. The next three boxes are a short overview of the most important datasueet to check, in case of a problem.

If you don’t know the answer These are no JJ Tubes. They are pre-selected in pairs.