On Saturday 23 May 2009, Joerg wrote: >Gene Heskett wrote: >> On Friday 22 May 2009, Joerg wrote: >>> John Doty wrote: >>>> On May 21, 2009, at 6:00 PM, Joerg wrote: >>>>> Chris Albertson wrote: >>>>> >>>>> [...] >>>>> >>>>>> I'm thinking about tube amps that had an output impedance of about 1M >>>>>> ohm that used transformers to drive 8 ohm speakers. About a 100,000 >>>>>> to 1 ratio. >>>>> >>>>> 1M? What kind of tube was that? >>>> >>>> Well, that's a typical plate resistance for a small signal pentode, but >>>> >>>> Power pentodes have lower plate resistance. >>> >>> Small signal, yes. But a 12AX7 won't be enough for a rock concert ;-) >> >> And its not even a pentode, its a dual triode, designed for phono preamps >> and such. > >Sorry, I meant something like the 6AU6.
Which fits the general thread idea a lot better. To me, a 6AU6 is a newer tube. 6SJ/K7's are middle aged, and the 4X's were popular for small signal & 2A3's for audio output's about the time I was born. And all are transconductance pikers compared to a 7788. :) And my spell checker does not even recognize the word! -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) The NRA is offering FREE Associate memberships to anyone who wants them. <https://www.nrahq.org/nrabonus/accept-membership.asp> Remember: Silly is a state of Mind, Stupid is a way of Life. -- Dave Butler _______________________________________________ geda-user mailing list [email protected] http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
