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The 2A3 is an audio power triode that is still used in amplifier designs. Modern manufacture reproduces this directly heated design. The 2A3 is normally used in a push-pull arrangement and care needs to be taken in the bias settings for each valve as a small change in grid bias will greatly alter the standing anode current and any mismatch will impair the reproduction quality.
The full document isn't yet available to us from the patent office, but we've found a related patent family member to use for our images and PDF. R1 is phenyl, pyridyl, imidazolyl, or pyrazolyl; wherein the phenyl, pyridyl, imidazolyl and pyrazolyl are each optionally substituted by 1 to 3 substituents independently selected from C1-C4 alkyl, C1-C4 haloalkyl, halogen, cyano, hydroxy and amino; R2, R3, R4, R5, R6, R7, R10, R11, R12, R13, R16, R17, R18, R19 and R30 each independently are hydrogen, halogen, cyano, C1-C4alkyl, or C1-C4haloalkyl; R8, R14 and R15 each independently are hydrogen or C1-C4alkyl; and R9 is phenyl, benzyl or group a : wherein the phenyl, benzyl and group a are each optionally substituted with 1 to 3 substituents independently selected from C1-C4 alkyl, C1-C4 haloalkyl, halogen, cyano, hydroxy and amino; or a salt or a N-oxide thereof. Share Patent Tools.
The definitive biography of a Mexican revolutionary reckoned a monster by some, a hero by many more. There's no doubt about it--at just over a thousand pages, this is the definitive work on Mexican revolutionary Pancho Villa, who has heretofore not received the attention granted fellow Conseguir libro impreso.