kambo said:so couple of 12BH7 arrived...
how do i measure/observe top and bottom half of 12BH7 WCF !
ac current on rk and ra ????
kambo said:thanks for the infos, yea read all that while back!
no cap from preamp stage to WCF, if that what u asked...
so,the big question is :
whats happening if i am doing push push on wcf... is it hurting the tubes feeling (joke )?
does it even care ?
Winston O'Boogie said:The bottom tube gets a bigger voltage swing due to the larger Ra, it's pushing up against the top cathode.
No real point in a white follower then. Might as well use a cathode follower with a current source underneath. This won't have the ability, like the White, to drive a theoretical twice its standing current into the load. Does that matter? Depends on the load you're driving.
Do folks complain about old LA-2a's not being push-pull balanced? No. So maybe none of this ultimately freakin' matters at the end of the day!
kambo said:btw, manley uses 2k and 305r
Winston O'Boogie said:I know the Manley circuits quite well, knew and dealt with David before his departure (bought his Neve 24 channel 1081 filled desk for one), and was friends with Eve Anna, staying at her place a few times. They make good stuff.
I think the circuit you're talking about is an older Manley design, might still be currently used, but it's possibly an older David one.
The whole issue of optimising White followers was not something widely known about or utilised until, I think, the 1990's when there was an article in Glass Audio magazine.
As I've said elsewhere, most of them out there in commercial products seem to have a too high Ra. I'd do it by the book myself since it costs nothing, but I'm not losing sleep over what others do.
kambo said:everyone has their reasons to use different Ra...
you think David didnt know how to calculate perfectly balanced WCF ;D
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