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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HQ tubes made for the Czech post, from the Rosnov factory Code Here are the possible answers, only ONE answer is correct. Like this, and no other way! However not with those! They were supplied with first class tubes by the manufacturers, and the dcc88 of origin is datsheet printed on the tubes. This is a much improverd version of ECC88 made, with higher voltage capabilities, higher plate dissipagtion, and better in many many ways.
Eech test must be in between following limits: Lucky on internet auction sites. So all four systems of this pair are the same.
Note, National was a tube re-branding company of very good reputation. JAN was the first choice, the rest got sold commerically. Is your ECC88 microphonic? These have lower noise, and less distortion. The frame dqtasheet wire is so thin, when you open up a defective tube, you can not see it with the bare eye.
On internet auction sites, tubes are re-labelled, retro-gold plated, re-branded and used tubes are put in datasheey new boxes with the stamps ne-newed. These tubes are boxed and branded “National” USA. So you take samples, you overload them for a certain time, and when too many fail the whole lot is rejected. This may help you more than changing tubes.
These are no JJ Tubes! These are the later technology, and also a technology only very few could make. The VI Version is balanced and matched, per datasheet specification, this is highest quality.
ECC88 Datasheet PDF
These appear like that. TESLA is even a frame grid tube! JAN Testing is a military proces for ecc8 qualification, which makes sure that weak production series will not pass as a whole. These were made for the military, as you can see from the sword signs on the back side of the tube.
Click for high resolution picture here. Perfect quality, good boxes. Well, I think experience and detailed product knowledge is the same! Tube is offered as used, but may be new. EHX new production under the microscope.
All others are gone, gone, gone. This is not normal for E88CC, test values can vary widely, and you have to take them as is. Buy only from reliable sources! This was told to me by a retired Telefunken Ulm Employee, so I think eccc88 is very reliable information. Interesting detail with the tube box. This pair has printed on the glass: Please note with some not with all the print text has suffered somewhat from storage.
Read below, how to connect the voltmeter. Mind you they draw twice the heater current. Called Uf Test with Voltmeter between Pin 4 datahseet 5. Read this table from the beginning. If you don’t know the answer This is a very critical one, and can cause a good tube to get defective, or give hum, sparks or other noise, when exceeded.
The frame grids have generally better parameter stability, lower noise and lower hum. It is not much but we have to say it.
ECC88 @ The Valve Museum
NOS original box Order nr for a matched and balanced pair: JAN tested, for higher reliability. When no, then skip this text. Leave it up to a technician otherwise. For a true happened story, read the world of NOS. These are no JJ Tubes.
However they bias not as trhey shouls in all circuits, and have slightly lower gain. In many problem cases, the ECC88 is not used correct.