The earliest audio amplifiers made use of small, 3 element
valves known as directly heated triodes. For many, the
simple circuits that can be built around such devices
better preserve the structure, colour and feeling within
the music than any other circuit topology. One of the
best sounding triodes, the 2A3, is in production again
and its characteristic linearity has been employed in
a novel configuration to create a particularly charming
amplifier. The Pure Sound 2A3 is an 18 Watt per channel
line level integrated design that allows for the selection
of up to 3 different source components and control of
the volume by a high quality ALPS Blue Velvet potentiometer.
There are many amplifiers now making use of directly
heated triodes but few which adequately address the
particularly awkward issues involved in driving these
devices properly. The Pure Sound 2A3 amplifier features
an unusual choke loaded driver stage which allows the
6SN7 driver valves to deliver the full measure of signal
to the push/pull output valves. This rather exotic configuration
usually results in a tremendous depth to the tone of
instruments and the puresound 2A3 is no exception in
Very high quality components are used throughout including
selected carbon film resistors and SCR polypropylene
capacitors. The power supply makes use of twin valve
rectifiers and choke smoothing.
The output can be configured for use with 4 or 8 ohm
The Puresound 2A3 may also be used as a very high quality
stereo power amplifier if the volume control is turned
• Output Power : 18 W per channel
• Frequency Response : 10Hz-82KHz (-1dB)
• Signal/Noise : 89 dB
• THD : 0.3 %
• Input Sensitivity : 850mV to full output
• Output Taps : 4 and 8 ohms
• Input impedance : 100 K/ohms
• Valve Complement : 6N9P x 2, 6N8P x 2, 5Z4P
x 2, 2A3 EH x 4
• Power Consumption : 240 W
• Dimensions : 435 x 350 x 190 mm
• Weight : 28 Kg
News, May 2010, (pdf-file)
Pig.com, Jamuary 2013
"What did surprise though was the bass performance.
Considering it replaced in my rack an all Class A KT88
beam tetrode amplifier producing 40w that I had been
previously rather impressed by, I wasn’t prepared
for just how solid the bass performance was"
"Modesty is a virtue, but it can be overdone,
and in my view this wonderful amplifier deserves to
be put on a pedestal and its praises sung from the rooftops"
AUDIO Oct. 2014
Klangurteil: 110 Punkte
Preis/Leistung: „sehr gut“
„Plus: Herzhafter Klang mit erstaunlich knorrigen
Bässen und bester Feinauflösung ...
Minus: ... aber nur an ausreichend lauten Boxen.“
Pure Sound 2A3 received just 1% less votes from the
public to be the winner in the 'integrated tube amplifier'
category. However we are very happy with our second
Sound 2A3 NL version
Special NL version with upgraded copper foil coupling
capacitors, Amtrans and Shinkoh resistors etc.