On Wed, 07 Nov 2007 16:34:34 -0800, Andre Jute
wrote:

It sounds as if it doesn't have parallal input ports at all (which
would be most unusual). It has an input port and a through port,
designed to link to a secong amplifier.

Bril. That's what the student is supposed to work out for himself.
It's a trick question. It's an amp to drive highvoltage electrostatic
headphones, and supply HV bias for the the diaphraghms. As such it has
to be inserted in existing chains. Therefore, through-ports.

Not a trick question, but a misleadingly incorrect one. There are not
parallal input connections.