Tube DIY Asylum

I think I should have said...

76.90.100.230

Tre'

In Reply to: RE: Class A push-pull posted by dave slagle on December 10, 2024 at 07:07:37

if you double the reflective impedance by up-tapping the OPT you need to double the inductance to keep the same relationship between the reflected impedance and the total load impedance as seen by the output tube.

and I should have left the F3 part out.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

Follow Ups:

RE: I think I should have said... - dave slagle 09:43:15 12/11/24 (3)
While what you say is technically correct, it glosses over the basic idea that the inductance has more to do with the characteristics of the drive impedance and not the value of the reflected load.

Taken to the extreme by your argument, a plate choke would need infinite inductance to match the reflected load. So would a line out transformer driving the grid of a tube. This opens up the whole large signal vs small signal can of worms which simply confuses the underlying concept. I think we can all accept that for a given tube, the more current that needs to be delivered to the load, the more inductance is needed. The idea that doubling the load requires 2X the inductance puts far too much emphasis in a FOM that isn't universally applicable.

dave
- FOM? nt - Tre' 09:57:47 12/11/24 (2)
  .
  Have Fun and Enjoy the Music
  "Still Working the Problem"
  - RE: FOM = Figure Of Merit - dave slagle 10:17:20 12/11/24 (1)
    figure of merit
    - Thank you. nt - Tre' 10:58:52 12/11/24 (0)
      .
      Have Fun and Enjoy the Music
      "Still Working the Problem"

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