EF12 ADZAM PENTODE TUBE TESTED WITH ROETEST V10 / NEW IN BOX
LOT OF 1 Pc.
The tubes passed all quality tests (vacuum, leaks, shorts etc.), measured with Roetest, curves analyzed, the buyer will get all data, actual datasheet – test protocol, for each tube.
In photos you can see example of data for tube.
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.
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.
Please allow for the following shipping times: EU countries: 10-15 business days, on rare occasions a few days more USA: 15-25 business days, on rare occasions more South East Asia (Japan, Singapore, S. Korea, Hong Kong, Taiwan etc) 20 business days, on rare occasions more India, 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. |