Description: MATCHED PAIR 6N8S REFLECTOR TUBES NEW SAME DATE CODES 1984 TESTED BY ROETEST V10 Tested with Roetest V10, "the Rolls Royce of tube testers" [emissionlab quote], a wonderful german professional system for testing tubes, it shows everything about a tube. A very careful selection of the best tubes from large batches, only few tubes from any batch meet our requirements for this selection. You are looking to a matched pair 6N8S tube (equivalent with 6SN7GT, direct replacement), all from 1984, best selected by curves using Roetest V10 professional tube testing system, the best tube tester that exists now, a wonderful device. If you have experience in the field of tubes you can find in the photos and in the details below the testing / sorting procedure and all the results, and if you do not have the necessary experience to understand what is explained you can trust that we deliver only the best tubes. The best method of selecting tubes in pairs is to overlap the G1/Ia curves, the superimposed curves show us that the tubes are matched in the whole operating range, not only in one point. Beside tubes you will get individual datasheet with all results after our tests, 1 A4 page for each tube, and one piece of original old soviet datasheet. The tubes (batch of 100 pcs.) are tested in our very well equipped laboratory, specialized in tube testing, with very well qualified personnel and with long experience in engineering. Before measuring each tube was heated for 30 minutes, for best results and for revealing gassy tubes. You will get the best tubes selected and the best sorting in pairs and quads that is possible. If you have a sophisticated amp/preamp with 1% tolerance components and high quality output transformer, don’t buy tubes at random with +/- 50% tolerance (means possible differences of 100% between tubes). As we can see in original datasheet for 6N8S, value for plate current is 5-9-13.5 mA, this means 55%-100%-150%. These large spread of parameters could be found at many kind of new tubes and from any producer, even if some of them don’t say it explicitly in their datasheets. Those who use tubes are more familiar with terms like bias, gain (µ), plate current, slope/transconductance, and maybe someone is wondering what the term „D of plate” in the measured data means. Its value in itself is not so important but it is useful to calculate the other parameters taking into account Barkhausen's tubular formula S x D x Ri = 1 (slope * penetration * internal resistance=1), where D is –dUg/dUa at Ia=const. Barkhausen vas a german physicist, he was “the guru” of tubes, his theory and formulas guided the entire period of electronic tubes. Name: 6N8SType: Double triodeApplication: LF voltage amplificationCathode type: oxide,indirect heatingEnvelope: glassFilament voltage, V: 6,3Filament current, A: 0,55-0,65Anode voltage, V: 250Anode current, A: 0,0055-0,0115Anode power, W: 2,75Grid1 voltage, V: minus 8Steepness, mA/V: 2,1-3,1Reverse grid current, uA: 2Microphnic noise, mV: 150Gain: 18,0-23,0Socket type: rsh5-1 Please allow for the following shipping times:EU countries: 10-15 business days, on rare occasions a few days moreUSA: 15-25 business days, on rare occasions moreSouth East Asia (Japan, Singapore, S. Korea, Hong Kong, Taiwan etc) 20 business days, on rare occasions moreIndia, China, Russia, Kazakhstan, Pakistan, Indonesia, Malaysia, Thailand, Australia, South Africa etc: at least 25 business days, but frequently around 35 business days Please note that shipping cost is calculated at average. If you have any objections please contact me for a specific quotation.
Price: 26 USD
Location: Bucuresti, default
End Time: 2024-01-09T14:00:52.000Z
Shipping Cost: 15 USD
Product Images
Item Specifics
Restocking Fee: No
Return shipping will be paid by: Buyer
All returns accepted: Returns Accepted
Item must be returned within: 14 Days
Refund will be given as: Money Back
Model: 6N8S Matched PAIR
Country/Region of Manufacture: Russian Federation
Type: double triode
MPN: Does Not Apply
Brand: REFLECTOR
