Nick Gorham wrote:
Tat Chan wrote:

that the function of valves as an amplifiing device is now obsolete as
it has been replaced by something cheaper and more efficient? (i.e.
the transistor)


Yep, agree with you there, cheaper and more efficient they are, linear
they are not.

Whats your point?

Most active components are non-linear in some way or another. Valves and
trannies included.

The *interesting* point is that you can (using appropriate design) make
a linear amp using these components.