Pair 6080wa/6as7/ecc230 Philips By Mullard Tested With Roetest V10 Black Plates
C230 PHILIPS BY MULLARD MATCHED PAIR BY CURVES TESTED WITH ROETEST V10 BLACK PLATES. Auctions is a pair of 6080WA Black plates in original Philips boxes but the tubes are Mullard as can be seen from the pictures according to the codes. 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. You are looking at a matched pair of NOS 6080, 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 very good tubes. The best method of selecting tubes in pairs is to overlap the G1/Ia curves, the superimposed curves show us that the tubes have the same plate current and the same transconductance in the whole operating range. One point matching method used with analog tube testers is a pretty good compromise solution, but identical tubes at one point can have big differences at higher or lower currents, testing in 20รท50 points with these devices and drawing curves take hours for each tube. Roetest does this quickly and with great precision. This is the best way to select pairs, based on overlapping curves.
The tubes meet datasheet specifications, first the quality tests - filament test, shorts test, gassy test (Ig1, vacuum factor, Ia variation with 1M2 grid series resistor), kathode isolation (leakage to filament), then quantity tests - value of current for plate, kathod, G1, value for transconductance, gain, G1 curve, Ia curve etc. All results for these tests can be seen on te datasheet delivered for each tube. If you have any objections please contact me for a specific quotation. Please look at my other listings!