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RE: Study and design of an all triode, 12W, PP amplifier.

A LM334 would not be my current source of choice here. A cascode BJT CCS like the ones found in Morgan Jones give exemplary performance at low currents. But maybe you don't want the hassle of a negative supply. If you do go with a 334 consider adding an extra diode and resistor to counter the positive tempco of the LM334. See page 8 of the data sheet linked. I've used this version in series with a resistor to provide a voltage reference for high voltage shunt reg. and it works very well. The voltage does not drift with temperature.


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