Operational Manual
3489-24 Kitagata. Iida-shi, Nagano 395-0151. Japan
Phone +81 265-25-8188. Fax: +81 265-25-8250. sales@almarro.com
vii
Technical Summary and Features
The A318B amplifier utilizes a one 6SL7 ( 6H9C)
tube on the input, one 6SN7 (6H8C) dual triode as
second-stage anode- follower, driving one pair of
6C33C output tubes.
Single -Ended Class A.
The Almarro A318B is an integrated single-
ended triode (SET) vacuum tube amplifier
designed as “Class A” type of amplification.
“SINGLE-ENDED" (SE) means that a single
output device handles the entire music signal.
“Class A” means that: “Grid bias and alternating
grid voltages are such that plate current in a tube
flows at all times”. (RCA Tube Manual). Most
professionals agree that “
Class “A" operation is
more efficient and wastes less power as heat,
while still maintaining low distortion.
The Almarro A318B single-ended amplifier
produces the best musical effect in the critical
midrange frequencies, at a very low level
distortion.
A preamplifier is not needed when using the
Almarro A318B integrated amplifier.
In spite of the moderate power output the
A318B is a very dynamic sounding amplifier due
to its design features and combination of tubes
selected fro the design.
Tubes
Tube amplifiers are based primarily on two types
of tubes – preamplifier tubes and power tubes.
Preamplifier tubes are used to drive the power
tubes.
The power tubes amplify the low-level
signal from the preamplifier into a level that is
sufficient to drive the speakers.
Input Tubes
The 6SL7 Tube
The 6SL7 (6H9C) is a dual tube is designed for
amplification of low frequency voltage. The 6SL7
(6H9C) double triode enclosed in the glass bulb
and provided with an octal base and an indirectly
heated oxide-coated cathode.
The Russian 6H9C is equivalent to the 6SL7 tube.
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