It is among the best audio tube you can possibly get. It is pure GOLD in any audiophile circuit. At Koschuh you can purchase original Telefunken tubes with confidence. Every tube is full working, tested, and in great condition. This is a computer-based measuring device. Click here for more.
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Like this, and no other way! May seem a silly advice, but it is a popular mistake. Also read here. Heater to Cathode. Read below, how to connect the voltmeter. Eech test must be in between following limits:. This is a jewel. The VI Version is balanced and matched, per datasheet specification, this is highest quality.
The rejects were probably sold a standard 6N1P, this is normal. Special attention needed: This tube excist as normal grid tube and as frame grid tube. The frame grids have generally better parameter stability, lower noise and lower hum. These are the later technology, and also a technology only very few could make. Frame grid wires can be as thin as 10um, which is technologically speaking a masterpiece of fine mechanics. The frame grid wire is so thin, when you open up a defective tube, you can not see it with the bare eye.
To give you an idea, the size of a large bacteria is 5um. When frame grid tubes, we write it in the description. This is a much improverd version of ECC88 made, with higher voltage capabilities, higher plate dissipagtion, and better in many many ways. However they bias not as trhey shouls in all circuits, and have slightly lower gain.
These have lower noise, and less distortion. Mind you they draw twice the heater current. Is your ECC88 microphonic? This may help you more than changing tubes. We have Money-back guarantee on those. Also you should try the Svetlana types 6N1P. The ones we sell, are "EB", also when not specified like this, it's what they are.
Is your ECC88 humming or making noise? When no, then skip this text. Used tubes of this type generally have more hum and noise. In many problem cases, the ECC88 is not used correct. Even with top-name amplifier manufacturers we see the same old errors, resulting from arrogancy, like not reading a datasheet.
Strangely so, but I see it over and over again. When you refer to finest datasheet details, they say they don't need to know, they have already "30 years experience". Well, I think experience and detailed product knowledge is the same! Anyway, not reading the datasheet may work with most tubes, but not with all. The negative result is, end users have to swap tubes all of the time, and desparately try to draw conclusions from this.
The next three boxes are a short overview of the most important thing to check, in case of a problem. Only do these measurements inside your amplifier, when you have experience with this. Leave it up to a technician otherwise. This is a very critical one, and can cause a good tube to get defective, or give hum, sparks or other noise, when exceeded.
Here are the possible answers, only ONE answer is correct. If you don't know the answer Read this table from the beginning. Hehe ;. Not good. All others are gone, gone, gone. TESLA is even a frame grid tube! Condition Qty. These tubes are boxed and branded "National" USA.
Note, National was a tube re-branding company of very good reputation. They were supplied with first class tubes by the manufacturers, and the country of origin is always printed on the tubes. So with them, what you pay is what you get. This pair has printed on the glass: "Made in Yugoslavia". Meaning they are EI tubes. This is confirmed by the construction, there is the characteristical A-Shaped getter holder inside, and more details.
Now that EI is closed since , prices of EI tubes are expected to soar. For a true happened story, read the world of NOS. JAN tested, for higher reliability. JAN Testing is a military proces for lot qualification, which makes sure that weak production series will not pass as a whole. This is a very hard way of testing, since "good" tubes must still be rejected when they come from a production series where too many have failed the JAN tests.
So you take samples, you overload them for a certain time, and when too many fail the whole lot is rejected. Now of course manufacturers could still sell such tubes on the commercial market, but the military refused to take those. This is the reason why JAN tested tubes are so often agvailable as commercial tubes also!! JAN was the first choice, the rest got sold commerically. E88CC Telefunken. Original box. Excellent NOS. These come with Amplitrex computer test report. That is: All tube data there is, including gain, Gm, Plate impedance, grid leakage, etc, and compare it against "must be" values.
For a pair, order two pieces, they are automatically packed as matched pairs if you do so. Please note with some not with all the print text has suffered somewhat from storage. It is not much but we have to say it. What is best, we had a small lot, and we have been able to select them all in perfectly balanced and matched pairs.
This is not normal for E88CC, test values can vary widely, and you have to take them as is. However not with those! They test all at 15mA, with grid voltage variation of less than 0,2 Volt!! Here is a Link to all test reports. So you can see it yourself.
You can order any pair you like, as long as we have it available. They are pre-selected in pairs. So if you order for instance tube 4 from this list, it is pre-matched with tube 8.
If you want a single you can only take the ones we have, we can not break up a pair for it. Interesting detail with the tube box. 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". Number "2" would mean outside Germany. This was told to me by a retired Telefunken Ulm Employee, so I think this is very reliable information. E88CC Tesla. Click for high resolution picture here. Gold Grid Version.
High Quality tubes from the Prague factory Code Original old blue boxes. These were made for the military, as you can see from the sword signs on the back side of the tube. This is probably the best ECC88 ever made. For the rest every little detail is identical. This batch had very good values. So all four systems of this pair are the same.
These are no JJ Tubes! Gold Grid Information. Click here. Order nr for a matched and balanced pair:
6922 / E88CC Tubes
E88CC Tube. Datasheet pdf. Equivalent