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. -- Regards, Joerg http://www.analogconsultants.com/ _______________________________________________ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user