Triode Loadline Confusion

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Triode Loadline Confusion

Postby rogerk8 » Thu Jul 10, 2014 11:30 pm

Hi Jac!

Long time no see!

I have a question.

I'm attaching a drawing of loadlines for a triode connected KT88.

I have imagined a self biased push-pull scenario where optimum load is 6 Ohms.

Drawing the loadlines for both 4 Ohms and 8 Ohms (on that same winding) still makes my Williamson amplifier feasable (with regard to some overall feedback and a very special type of output transformer which can handle some Class AB without going into saturation).

You may view the square as optimum dynamic bias and the triangles as the dynamic quiscent point change according to 4/8 Ohms usage.

This looks rather ok to me but my question is, what happens with the quiscent point if the loudspeker is of say 100 Ohms?

Then the static quiscent point (circle) has nowere to go, so to speak.

Will it just move "horisontally" along the static quiscent point, or what happens?

Best regards, Roger
KT88 Loadlines
kt88_RL_jac.GIF (30.07 KiB) Viewed 2742 times
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Re: Triode Loadline Confusion

Postby J. Leven » Wed Sep 17, 2014 1:53 am

The operating point is determined by the quiescent current and anode voltage,
both are relatively constant, the load changes from 4 ohms to 8 0hm , the straight line inclines more to the horizontal direction ,
the working point did not move to right or left
J. Leven
Posts: 170
Joined: Fri Jan 13, 2012 12:27 pm

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