Mosfets provide the widest bandwidth of solid state power devices, however they were not
chosen for this reason. The design of the Aleph 60 does not seek to maximize the amplifier
bandwidth as such. The capacitances of the Mosfets provide a natural rolloff in conjunction
with the resistive impedances found in the circuit, and the simplicity of the circuit allows for
what is largely a single pole rolloff characteristic.
The slew rate of the amplifier is about 40 Volts/uS load , which is about 10 times faster than
the fastest signal you will ever see, and about 100 times faster than what you will be listening
to. In and of itself, the slew rate is an unimportant factor when evaluating tube and simple
Mosfet designs. It becomes more important with complex circuit topologies where there is
heavy dependence on feedback correction, but even then its importance has been overstated.
The amplifier is powered by a toroidal transformer which charges 120,000 uF capacitance.
This unregulated supply feeds the output transistors only with a full power ripple of about .3
volt. The power draw of this system is constant regardless of the music playing through the
amplifier. As such, it does not depend on a high quality AC outlet or special power cords,
since the dynamic performance does not create a variation in AC line draw. If the AC line is
running low, the output stage will bias to a higher current level by way of compensation.
The amplifier is stable into any load impedance or reactance including a direct.
The Aleph 60 is impervious to electrostatic shock at the input and dead shorts at the output.
You can safely plug and unplug inputs and outputs while the amplifier is running. (Do not try
this with other products).The Aleph 60 is protected from overheating by a 75 degree C.
thermostatic switch, and from internal failure by a slow-blow fuse.
The Pass Aleph 60 is warranted by Volksamp to meet performance specifications for 3 years
from date of manufacture. During that time, Volksamp will provide free labor and parts at the
manufacturing site. The warranty does not include damage due to misuse or abuse or
modified products and also does not include consequential damage.
