Full Product Overview & Specification
The Fusion HB70p is designed to offer exceptional realism
in a Hi-Fi system without having to use vacuum tubes in
the output power stage.
Combining modern features with classic analogue design
principles the HB70p achieves remarkable results by featuring
our own proprietary circuit design called T-ODE-FET. This is
essentially a hybrid design, combining Mosfets with a vacuum
tube input stage in a novel circuit configuration, allowing
the unit to offer good output power levels in a compact space
saving contemporary design. Our experience in designing tube
amplifiers has enabled us to offer similar levels of performance
usually only found in our pure tube designs. This amplifier
design is not a compromise but an exciting breakthrough
in what can be achieved by combining technologies.
The unique T-ODE-FET circuit developed at TT is different to
many other hybrid amplifiers which have recently entered the
Hi-Fi market-place. The overall circuit topology features
a single rail power supply for the output stage whilst the
double triode input stage remains part of the whole feedback
loop, emphasizing the sonic character of introducing a tube.
This also ensures a very natural musical character and
minimises odd order harmonic distortion components.
The highest-grade milspec 6922 vacuum tube is used in the
front end input stage of the amplifier which is powered from
a dedicated supply including a constant current source,
minimising tube drift over time.
The output devices were selected after exhaustive listening
tests to many types of Mosfets. The final devices selected
offer high current transfer and excellent audio characteristics.
The response curve is very similar to a power triode. A very
stiff power supply has been designed to give the amplifier
very controlled detailed performance whilst delivering full
power over an increased audio spectrum of 5Hz to 65 kHz.
As part of the Fusion range the HB70p is housed in the same
family case work, maintaining a high standard of build
Sonically the Fusion HB70p is a very clean and open sounding
amplifier. Excellent bass drive and detail together with a full
tangible mid-band, an area that tube amplifiers excel in and
solid-state counterparts struggle with. In it's price range
the Fusion HB70p offers an unbeatable introduction into
the world of audiophile amplifier performance at a
fraction of the cost.
The HB70p uses the same power stage featured in the HB70i,
but is built without the FET preamplifier. The HB70p Power
Amplifier is an ideal addition to the HB70i if bi-amping or
tri-amping a system or if a more exotic pre/power system is
required, it may be used with any of our preamplifiers such
as the Fusion Preamplifier.