ECC88 page sheet date. 1. 1. 2. 2. 3. 3. 4. A . 5. B. 6. C. 7. FP. Page 1. Page 2. Page 3. Page 4. Page 5. Page 6. Page 7. Page 8. Page 9. Page Page Page Page Page Page Page Eech test must be in between following limits: ECC 6DJ8. 6,3V. is balanced and matched, per datasheet specification, this is highest.

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Unfortunally a big item particularly with this tube number. Here are the possible answers, only ONE answer is correct. Well, I think experience and detailed product knowledge is the same! This tube excist as normal grid tube and as frame grid tube.

So you think you buy NOS, but they’re not. Left tube on the picture. Number “2” would mean outside Germany.

Frame grid wires can be as thin as 10um, which is technologically speaking a masterpiece of fine mechanics. Perfect quality, good boxes.

ECC88 Datasheet

Very good selected, and this batch has very high test values. The next three boxes are a short overview of the most important thing to check, in case of a problem.


This is a very critical one, and can cause a good tube to get defective, or give hum, sparks or other noise, when exceeded. JAN was the first choice, the rest datenhlatt sold commerically. They are pre-selected in pairs. This was told to me by a retired Telefunken Ulm Employee, so I think this is very reliable information. If you want a single you can only take the ones we have, we can not break up a pair for it.

This batch had very good values. To give you an idea, the size of a large bacteria is 5um. Used tubes of this type generally have more hum and noise. Buy only from reliable sources! For the rest every little detail is identical.

So with them, what you pay is what you get. This may help you more than changing tubes. This is a very hard way of testing, since “good” tubes must still be rejected when they come from a production series where datenblwtt many have failed the JAN tests. Curve plots for popular current production12AX7’s: Everything you want to know about how tube specsare determined, from flywheel shock testing to altitude testing to salt spraycorrosion resistance.


These tubes are boxed and branded “National” USA. Here is a Link to all test reports.

This is a much improverd version of ECC88 made, with higher voltage capabilities, higher plate dissipagtion, and better in many many ways. They are waiting for you there.

Resistance Coupled Amplifier Charts: The negative result is, end users have to swap tubes all of the time, and desparately try daetnblatt draw conclusions from this. Order nr for a matched and balanced pair: What to do, and why you shouldn’t panic.

The Big Tube Data Page

High Quality tubes from the Prague factory Code Low noise version of 6N1P. When frame grid tubes, we write it in the description. The ones we sell, are “EB”, also when not specified like this, it’s what they are. The frame grid wire is so thin, when you open up a defective tube, you can not see it with the bare eye.