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Old 16th January 2006, 07:21 PM   #1
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Default Why hybrid CCS?

Background: I am searching for my next input stage for my EL84M PP, which right now consists of paralleled 6922 triodes in a long tailed pair with a MOSFET CCS. So I was looking at things like a cascoded long tailed pair and various forms of CCS's as a "step up".

So in Morgan Jones' book I do see some hybrid CCS's, basically shown as SS CCS's on the cathode of a pentode such as and EF184, in which the combination of SS and tube is used as a CCS for the cathode of a driver tube. What does this improve over just using the SS portion alone?
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Old 16th January 2006, 07:36 PM   #2
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Prettier and higher voltage compliance; an EF184 can dissipate 2.5W and operate with 250V across it.
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Old 17th January 2006, 10:03 AM   #3
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Or, why not ust the pentode alone? If you look at the plate curves of a good small signal pontode, they're almost horizontal at low currents with a suitable screen voltage.
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