ALLNIC AUDIO A-5000 NEO Panduan Pemilik - Halaman 4

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INTRODUCING THE A-5000 NEO 300B SET

MONOBLOCK POWER AMPLIFIER

The A-5000 NEO monoblocks are Allnic Audio's top of

the line power amplifier model. Like all Allnic Audio

products, the A-5000 NEO has Permalloy (iron and

nickel alloy) for its 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 A-5000 NEO has the following features:

25 watts of pure class A high power output. The A-5000



NEO is a parallel single ended power amplifier. Almost all

other 300B amplifiers are under, and distortion, driven.

This is a result of the use of conventional "Resister-

Capacitor" circuits, which give only up to around a 70V

swing voltage, with high distortion. This means that an

already distorted signal of a lower than optimum swing

voltage is directed to the deep biased 300B grid. Allnic's

powerful "Inductor Drive" circuit gives up to a 150V swing

voltage, with very low distortion (about 0.3%). It is this

drive delivered to the A-5000 NEO that allows for a

significantly higher output (25w) than the approximately

18 - 20w output that could be expected from standard

300B circuits.

Real power drive. The driver tube, a 6GV8, is a very strong



power pentode. We use this power pentode to drive the

300B's via a choke plate inductor. Our choke inductor

(100% nickel permalloy PC core) has very low power loss

and infinitely high load impedance. This configuration is an

ideal drive stage for 300B SE.

Nickel alloy output transformer. Allnic uses sophisticated



ratio mixed nickel permalloy PB cored output

transformers. Because of their extremely high initial

permeability, it is possible to use lower turns on the

primary winding while retaining very high 'open circuit

inductance". That means a resulting very wide frequency

range and low distortion bass response. This is another

reason why the A-5000 NEO excels over other 300B power

amplifiers. Allnic also uses a very big nickel core, so as not

to be magnetically saturated at a high current of level of

200mA.

Long life and trouble-free operation. Allnic employs a



"soft start circuit" to protect the tubes and other parts. It

applies the high B+ voltage only after tubes are fully warmed-

up.

Fixed bias control grid. Allnic prefers to use low distortion and



high output "fixed bias" rather than the relatively higher

distortion and lower output "self bas" method. That way, it is

possible to eliminate the use of cathode resisters and their

associated heat production.

 Natural negative feedback. The A-5000 NEO applies about -

6dB of negative feedback. This is a very complimentary

amount of negative feedback that differentiates the Allnic

300B single ended amplifier from the standard, which has a

very coloured and weak speaker driving force. With this

natural feedback, the A-5000 NEO has a relatively high

"damping factor', very low distortion, and a higher S/N ratio,

without losing the signature single ended natural sound

quality.

 Hard wiring. The A-5000 NEO is all hard wired; circuit boards

are not used.

 Beautiful 20KHz square wave response. See Figures 1-3.

Fig.1 Square Wave 50Hz

Fig.3 Square Wave 20KHz

Measured by LEADER LAG-126 Audio Signal Generator

and KENWOOD CS-4125 Oscilloscope



As are all Allnic Audio products, the A-5000 NEO is fully

RoHS (EU Reduction of Hazardous Substances regulation)

compliant in construction and materials.

Fig.2 Square Wave 1KHz