[quote author="NewYorkDave"]I've said this before and nobody listens, but I'll say it one more time: you can't really make a proper op-amp (for audio use) with only two twin-triodes. You certainly can't meet your target specs that way. Yes, I know the Philbrick K2-W used two 12AX7s, but it's not anything you'd wanna put your audio through. And most of the latter-day "tube op-amp" designs I see floating around on the web are not really proper op-amps.
On the other hand, three twin-triodes would do the job nicely: two triodes for diff pair, one triode for current-source "tail", one triode for common-cathode stage following diff input, two triodes for push-pull output (White CF type).[/quote]
I omitted the use of the WCF.
analag
On the other hand, three twin-triodes would do the job nicely: two triodes for diff pair, one triode for current-source "tail", one triode for common-cathode stage following diff input, two triodes for push-pull output (White CF type).[/quote]
I omitted the use of the WCF.
analag
