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INTRODUCING THE A-5000 DHT
300B SINGLE ENDED, PURE DIRECT HEATED TRIODE
MONOBLOCK POWER AMPLIFIER
The A-5000 DHT monoblock, like all Allnic Audio products,
uses 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 DHT has the following features:
All Direct Heated Triodes – The A-5000 DHT monoblock
amplifier is a pure direct heated triode, tube rectified
power amplifier. It uses only direct heated, single ended
tubes from input to output. The first stage is a new old
stock Marconi HL-2; the second is a new old stock STC 3A-
110A (or equivalent); the third is the famous 300B. This is
an ideal combination of pure direct heated triodes,
resulting in unparalleled faithfulness to the incoming
signal, incredible musicality and detail, and quick,
articulate bass.
Real power drive - The driver tube is the 3A-110A (or
equivalent). Allnic uses this direct heated triode 3A-110A
tube to drive the 300B to its correct specifications via a
choke plate inductor. The choke inductor (with a 100%
permalloy core) has very low power loss and an infinitely
high load impedance. This configuration is an ideal drive
stage for the single ended 300B and produces 10 watts of
pure class A, extremely low distortion, high power output.
Nickel alloy output transformer - Allnic uses sophisticated
ratio
mixed
nickel
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 DHT 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.
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 bias" method.
That way, it is possible to eliminate the use of cathode
permalloy
PB
cored
resistors and their associated heat production.
Natural negative feedback - The A-5000 DHT applies about
-6dB of negative feedback. This is a very complimentary
amount of negative feedback that differentiates the Allnic
300B single ended amplifiers from the standard, which
have a very coloured and weak speaker driving force.
With this natural feedback, the A-5000 DHT 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 DHT 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
output
Measured by LEADER LAG-126 Audio Signal
Generator and KENWOOD CS-4125 Oscilloscope
As are all Allnic Audio products, the A-5000 DHT is
fully RoHS (EU Reduction of Hazardous Substances
regulation) compliant in construction and materials.
4
Fig.2 Square Wave 1KHz