So with them, what you pay datashert what you get. With good test value also, but these we could not match. Left tube on the picture.
Also you should try the Svetlana types 6N1P. Number “2” would mean outside Germany. This is a much improverd version of ECC88 made, with higher voltage capabilities, higher plate dissipagtion, and better in many many ways. Lucky on internet auction sites. These were made for the military, as you can see from the sword signs on the back side of the tube.
This is a very critical one, and can cause a good tube to get defective, or give hum, sparks or other noise, when exceeded. Buy only from reliable sources!
The ones we sell, are “EB”, also when not specified like this, it’s what they are. Check also next item, below here. Also read here Uh-k. Only do these measurements inside your amplifier, when you have experience with this. Like this, and no other way! The negative result is, end users have to swap tubes all of datasueet time, and desparately try to draw conclusions from this. The frame grid wire is so thin, when you open up a defective tube, you can not see it with the bare eye.
Set it on AC, and if nothing is read, dahasheet it on DC.
Anyway, not reading the datasheet may work with most tubes, but not with all. However they bias not as trhey shouls in all circuits, and have slightly lower gain. All from the same factory code.
You can order any pair you like, as long as we have it available. Clear white print like new, from spare equipment. Some tubes from equipment are sometimes actually never used. To give you an idea, the size of a large bacteria is 5um. Read below, how to connect the voltmeter.
Tube is offered as used, but may be new. We have Money-back guarantee on those. Frame grid wires can be as thin as 10um, which is technologically speaking a masterpiece of fine mechanics. Here is a Link to all test reports. Is your ECC88 humming or making noise? These are no JJ Tubes! When no, then skip this text. 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.
Don’t try to be Mr. Large dimension ECC88, with higher dissipation. Here are the possible answers, only ONE answer is correct. TESLA is even a frame grid tube! This is not possible for the most wanted part numebrs.
E88CC @ The Valve Museum
For a true happened story, s88cc the world of NOS. Low noise version of 6N1P. Printing is fainted, but unburned, very white still. So all four systems of this pair are the same. Done so in when these were made, but JAN testing is still used for semiconductors as well. Note, National was a tube re-branding company of very good reputation.
E88fc tube excist as normal grid tube and as frame grid tube. Is your ECC88 microphonic? Original old blue boxes. Made on Philips machines. If you don’t know the answer This pair has printed on the glass: