Each channel has a completely separate amplifier with its own power transformer, anode power supply, bias, tube heater and other circuits that do not have connections with circuits the second channel of the amplifier. This allows you to obtain the perfect stereophony received as a spatial, full sound when it comes to the frequency and the stage. Class A ensures the highest sound quality and eliminated distortions.
Due to the fact that Single Ended amplifiers have the lowest efficiency (about 25%) in each of the Silverbird channels, we used two 300B tubes connected in parallel. This allows you to get more power than with a single tube operating in SE mode. In the case of two 300B tubes operating in such a system, it is possible to obtain power of up to 18W per channel, which is already enough to drive most loudspeakers.
A double triode 6H30Pi EHG was used in the Silverbird amplifier control stage. In conjunction with the 300B tubes and Edis speaker transformers, the sound of the amplifier offers a very warm and musical sound with details. Silverbird completely reflects the character of the 300B tubes, with which it is difficult to compete during classical or jazz music auditions.
Silverbird Dual Mono has two dedicated power transformers for audio devices from toroidy.pl (each for a separate channel). This allows you to cancel the transformer’s vibrations and silence its work. Each of the transformers gives voltage to the anode power supply, driver tubes and power tubes (tubes glow with constant current stabilized by electronics which eliminates disturbances of the power network), bias power supply and VU meter backlight on the front panel, which is an indicator of the amplifier’s control.
In the output section of the Silverbird Dual Mono amplifier, there is a Edis LO-PP80-3 loudspeaker transformer, which provides the possibility of cooperation of the amplifier with a load of 4Ω, 6Ω and 8Ω. There is a 4Ω / 8Ω selection selector on the rear panel (for an impedance of 6Ω loudspeakers the 8Ω setting is selected). Both transformers are located inside the amplifier chassis. Thanks to this, it was possible to avoid putting them on the top panel, which often happens in many designs of tube amplifiers. Although, as a standard, we use cheaper transformers with non-morphic cores as an option, it is also possible to order a copy of the Silverbird amplifier equipped with a pair of output transformers with amorphous cores manufactured by Edis – L. Olgonowski. They provide absolutely uncompromised sound quality.
At customer’s request, it is possible to equip the amplifier with an additional remote volume and power control module. In addition to the potentiometer, it is also possible to mount a resistor ladder by Khozmo Acoustic also in the version with the motor enabling the remote control.
Silverbird Dual Mono is made in a large metal casing to which high quality branded sockets are mounted. However, it is possible to choose non-standard connectors according to the customer’s wishes. The amplifier stands on solid, wide legs made of high quality aluminum. The feet from the bottom have a rubber layer which additionally to weight – almost 30kg – stabilizes the amplifier on the ground.