[Scott Dorsey]

Nigel Goodwin wrote:

It's not down to output 'resistance' (should be impedance anyway), it's
mostly down to the power supply that can't supply enough power. The
output impedance of transistor amplifiers is extremely low, tiny
fractions of an ohm.

No, the output impedance get actually pretty high at low frequencies,
BECAUSE the power supply can't supply enough power.

The actual amplifier impedance is the series impedance (mostly resistive)
of the output stage, PLUS the impedance (mostly capacitive) of the power
supply.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."