Ashly Power Amplifiers FET-200 - Manual (Page 4)

Both amplifiers are fully complementary, push-pull type with totally discreet,
high voltage, wide bandwidth electronics. This approach inherently assures
low noise, low distortion, and excellent transient response. Inputs are
bringing, active balanced (transformerless), equipped with both 1/4" jacks and
XLR-type connectors of both sexes to facilitate linking several amplifiers
together. All input connections can, however, operate as balanced or
unbalanced. This is determined by the connector used in conjunction with the
input. Stereo, mono and bridging modes are user selectable by means of rear
panel switches, requiring no internal modifications or additional components.
All electronic components are conservatively rated and are mounted on a rugged
glass-epoxy circuit board. An efficient U-I laminated power transformer saves
space and minimizes magnetic flux leakage, permitting other low-level
equipment to be mounted above or below the amplifier with no danger of induced
hum. Large value, computer grade electrolytic capacitors assure long service.
Two lU-segment, 27 dB range LED meter displays provide an easily viewed
indication of power levels, and a separate LED indicates thermal overload.
HECIL\NICAL
Ihe Ashly MOb-FET power amplifiers are packaged in a rugged, one-piece welded
16 gauge steel chassis with an anodized aluminum front panel and an easily
removed steel top cover. The chassis and ail internal components are
integrated into a single, rigid unit. The FET-500 requires 5 1/4" of rack
space and the FET-200 requires only 3 1/2". The power transformer is located
near the front of each amplifier, reducing mechanical stress on the chassis.
Each channel's electronics and heat sink are combined into a compact, plug in
module which can be removed from the amplifier in seconds. Hard wiring is at
an absolute minimum.
Large heat sinks and an aerodynamic internal design permit the use of an
ultra-quiet, slow speed fan which pulls air in through the front panel
directly across the heat sinks and power transformer, and out through the rear
panel. It is unnecessary to provide space or ventilation above or below the
amplifier, allowing for economical use of rack space.
The amplifier's output connectors are conveniently arranged on standard 3/4"
spacing tor quick interconnect via banana plugs. Selecting the bridging output
involves only moving the banana plug to the two center (RED) connectors. Both
the AC line and the speaker terminals are fused protected. Fuses can be
removed instantly without tools. There are no internal fuses.
IN USE
ELECTRONIC
The result: better sounding amplifiers, remarkably un-fussy about how you use
them. They will tolerate low impedance, highly reactive loads and hot,
crowded racks. They are highly immune to RF interference and will not be
damaged by intermittent short circuits—sustained shorts will simply blow the
output fuse. Due to their balanced circuit design, the use of delay circuits
and output relays are unnecessary. There is no turn-on thump and the volume
controls can remain up when power is applied and removed. Both amps will keep
on running right through a brown-out, even when line voltages fall to as low
as 20 volts!