"6C45P is a stunningly linear valve. It wants >10mA of anode current before it wakes up properly, but can operate with quite low anode voltages (100V). There does tend to be a bit of grid current, so you have to be careful if you take liberties with the (150k max.) grid leak resistor. Because Cag is so high, you can't really use it as a gain stage unless you drive it with a cathode follower (or a moving coil cartridge) unless you don't care/can't measure the HF response. "
"Using the 6S45 at 18mA is fine, trust me. I prefer even lower anode currents, make the anode current too high and the sound of ANY High Gm Valve I have played with becomes hard and steely, pretty much that kind of sound people have criticised in the 6S45 when used as driver valve, simply because they acted on the idea "if it's rated at 50mA Max I must operated it at 60mA!".
"6C45pi is a cracking little valve with super linearity, but it needs care to stop it oscillating at VHF. Decouple the HT locally, use a carbon-film grid-stopper, and if you use it as a cathode follower, add a cathode-stopper. It needs a bit of current to wake it up, but 15mA is quite sufficient. I don't believe the 7.8W rating from that envelope at normal temperatures, although a gentle draught of air at -50C (temperature at 50,000 feet) would comfortably enable the rating."
KnB: Her er noen sitater fra hva folk på diyaudio har erfart med 6C45pi og arbeidspunkt. Fort gjort å finne info, men det gjelder som alltid å plukke ut god mot dårlig! Han med det nederste sitatet har nicket "Ec8010" og er vanligvis pålitelig.
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