Are MOSFET's voltage, not current, devices?

Jeffreybehr,yes,Herman did magnificently.I was of course referring to 'simply' being the key word in reference to non-tech lingo,so appreciated by laymen/rookies in this field such as I.Keep the ball rolling,good stuff,Bob

Guys: Thanks.

Actually, MOSFETs have a very high output impedance, typically in the megohms for a modern power device. Bipolars do too, although slightly less as reduced by the Early Effect. The output impedance of pentodes is lower, typically in the tens of k-ohms for a power device, and the output impedance of the triode is lower yet, with output impedances typically around one k-ohm for a power device. What transistors do have is a much higher current density capability than tubes. Tubes generally handle higher voltages better than transistors, and thus the need for an output transformer (or ZOTL). One must not confuse high current with low impedance when it comes to active devices as these concepts are very different. All ss amps that deliver low output impedance do so with high feedback. This can be done without loop feedback in the form of local feedback. Emitter follower or source follower configurations are common local feedback schemes that deliver low output impedance, and these are classified as feedback circuits. Only triode output stages can produce acceptable levels of damping without feedback (through a transformer or zotl). This self-damping characteristic of triodes, I believe, is the reason that triodes produce the least agressive sound of any of the amplifiying devices, all else being equal.