Sissy iznad
6SN7GTB medium-mu triode vs 6AU6A pentode
6SN7GTB medium-mu triode: Noise floor is about 130 dB below the fundamental; second harmonic is 52 dB down [blue curve, above]. Operating conditions were taken from the resistance-coupled amplifier tables in RCA tube manual RC-21, 1961, p. 439. Note: the voltage gain of this device is much lower than that obtained with any of the transistors or the pentode.
6AU6A pentode: Noise floor is about 120 dB below the fundamental; second harmonic is 48 dB down [red curve, above]. Operating conditions were taken from the resistance-coupled amplifier tables in RCA tube manual RC-21, 1961, p. 438.
https://spectrum.ieee.org/consumer-electronics/audiovideo/the-cool-sound-of-tubes/3/distortion
Ne znam .... meni su svi harmonici (ne samo drugi) slični sa lampama ovde - odnosno cela prenosna karakteristika (kao ništa što sam do sad video).... Jedino što ceo grafik beži za +8 db u pikovima po harmonicima. Na Sissy je dugi harmonik -40db down.
Naravno brzina na ovim graficima se ne vidi. Koja je u nanosekundama i za lampe i za THF.