ALLNIC AUDIO M-2500 Owner's Manual - Page 4

Browse online or download pdf Owner's Manual for Amplifier ALLNIC AUDIO M-2500. ALLNIC AUDIO M-2500 16 pages. Px25/300b/kt150 push-pull monoblock power amplifiers

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INTRODUCING THE M-2500 PX25/300B/KT150 PUSH-PULL MONOBLOCK POWER AMPLIFIERS

The M-2500 monoblock power amplifiers are Allnic Audio's top of the line, power tube flexible, push-

pull monoblock power amplifier model. Like all Allnic Audio products, the M-2500s have Permalloy

(iron and nickel alloy) for their transformer cores. Allnic is grateful to Mr. G.W. Elmen of Western

Electric for inventing Permalloy for transformer core use, and in so doing, providing an enormous

service to recorded music listeners everywhere.

The M-2500s use the superbly musical PX25, 300B or KT150 (customer's choice on ordering) power

tubes in push-pull configuration to provide the power that push-pull application facilitates but

retaining the special musicality of the PX25/300B/KT150 tubes. The M-2500s have the following

features:

• The M-2500s are push-pull monoblock power amplifiers. They provide continuous power as follows:

o PX25: 20W Triode

o 300B: 30W Triode

o KT150: 100W Pentode

• Powerful Driving Circuitry. Allnic believes in the importance of using high-quality, low noise and

powerful driving circuitry in all its amplifying devices. Off-the-shelf design is not a part of the magic of

these amplifiers. Tubes and transformer characteristics are closely matched to complement each other

to achieve the most accurate and satisfying sound. In the M-2500s using 300Bs, we employ the 6485

pentode tube in triode mode as the input tube. Using the 6485 in triode is extremely beneficial as it

improves the high frequencies, helping to maintain the characteristic sound of the 300B power triode.

The 300B and PX25 versions use a pair of 12A4 tubes as the second stage driver tubes. In the PX25 and

KT150 versions, the exceptionally accurate and stable 5654 is used as the first stage. In the KT150

version, a pair of 6S4 tubes is used for the second stage drivers. The listener can easily hear and even

"feel" the differences between these designs and other, more conventional ones. Please imagine, as you

listen to the M-2500s, its sound compared to the sound of an amplifier using conventional, for example,

6SN7, 6922, 12AU7 or 12BH7s.

• Direct-heated Vacuum Tube Rectification. The M-2500s use a direct-heated 5U4G full-wave rectifier

tube rather than a semiconductor diode in the rectification circuit. This provides both sonic benefits and

improved protection for the PX25/300B/KT150 power triode tubes.

• "Full Engagement" Output Transformers. Conventional output transformers use pre-set secondary

windings to accommodate 4, 8 and 16 ohm loudspeaker loads. However, these conventional

transformers utilize

only one secondary winding at a time, while the other secondary windings remain "idle". This approach

has two adverse effects. First, the output transformers are not working at their maximum efficiency,

reducing their output relative to their potential. Second, the "idle" windings are not actually "idle"; they

are subject to parasitic oscillations, producing their own "signal". This undesirable electrical information

is additive to the transformer's output, distorting the amplified signal going to the loudspeaker. Allnic's

"Full Engagement" transformers address these issues by having 4 independent, secondary windings that