The ABH800 preamp section features an all valve direct signal
path through the input and gain amp, EQ and Contour circuit,
the 5 band Mid equalizer, the Compressor, and nally the preamp
output stage. Because if the complexity of circuitry required for
the side chains of these features, they are devised using solid state
circuits, but where possible they are constructed using very high
voltage circuits with 60 volt op-amps.
The solution for the power amp mixes a valve front end covering
phase inverting & driver duties with a special bridged power
solid-state power amp. The valve front end provides the valve
tone whilst the solid-state section provides the push-pull high
power section. Uniquely for a bridged amp this is provided with
a Constant Current output emulating the action of a big output
transformer and also provides drive for both local and global
feedback as happens in an all valve power amp. It also allows
switching to help match both 4 and 8ohm operation allowing
the use of either 1 or 2 cabinets (8 ohm each) with full power. This
power amp design is also in the ABH800PA power amp, so can be
used not only as a power builder coupled with the ABH800H, but
also a stand-alone power source for a preamp of your choice.
The chassis design is a complete 3U 19 inch rack case, and is
supplied in an Albion ABH styled cabinet with heavy duty grab
handles on each end. Just remove the chassis from the case if full
rack mounting is required.
ABH800/BLS610H
Rear panel features: - 2 x Speakon outputs, 4/8 ohms signal
matching switch, tuner output, series FX loop with level & bypass
switching, slave (power amp) drive output jack, valve derived XLR
D.I. connector with ground lift. Resettable circuit breaker, Mains
input connector.
Hybrid power amp (VTH Technology) with valve limited (for
soft clipping valve characteristics) 800 watts RMS power plus
additional solid-state power for high transient response. The solid-
state power section is uniquely (we believe) configured with a
Constant Current output with localized and global feedback to
give a transformer-like output.
ABH800PA
800 watt RMS Bass Hybrid Power amplier. 3U 19”
chassis in Vinyl covered heavy duty case. 1 x 12AX7
tube.
ABH800H
800 watt RMS Bass amplifier, fully featured tube
based preamp/hybrid power amp.3U 19” chassis in
Vinyl covered heavy duty case. 4 x 12AX7
8
2014 PRODUCT BROCHURE
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