Thank you for correcting me and providing more information! W dniu wtorek, 9 października 2018 17:31:24 UTC+2 użytkownik jrehwin napisał: > > In the last years of serious tube research and design there was a new type > of cathode created, which was as efficient as previous types, but was > immune to this effect. Most of tubes designed to be used in digital > circuits were designed with long times with no anode current flowing. > > > There are a lot of myths about this, some disparaging metallurgy in the > 1950s and 60s, referring to cathode impurities. They are false. The tube > business, like any business, focussed on volume and cost cutting. Early > on, the tube manufacturers determined that adding a small amount of silicon > to the (nickel) cathode sleeve accelerated the activation process, saving > time and money. > > Later, when computer applications came around, the "sleeping sickness" > problem arose, where cathode interface would raise the cathode (and tube) > impedance during long periods of cut-off operation. A little research > revealed that this was caused by the added silicon. > > The tube manufacturers responded by offering "computer" tubes which were > produced without the added silicon, and therefore required the longer (and > more expensive) activation. This worked fine. To save money, the > manufacturers would often use older tooling for the computer tubes, as > linearity was not important. > > Amusingly, a few modern audiophiles prefer the computer tubes, figuring > they must be "better", but in some case, the computer rated tubes will be > made with older tooling and have less linearity than the non-computer > versions. > > - John > >
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