This new single ended class A amplifier was developed especially for audiophiles who own high quality high efficiency horn loudspeakers and desires the excellent sonic characteristics of a single ended amplifier. Systems with an efficiency 100 dB/1 W/1 m and less require more power to guarantee  the desired dynamics with tight bass. Uncompromising mono construction guarantees highest resolution, brilliance and roominess in music reproduction.

The use of single ended amplifiers with horn loudspeakers is advantageous, if the amplifier has very low noise. Hum is very hard on the ears. This requires a very high quality power supply. Due to this regulated DC heating, double choke filtered high voltage is used. This along with good circuit design results in very low noise output, of only 200µV.

Due to the nature of unbalanced power supply there is always the risk that when the amp is switched off a strong spike pulse can be send to the loudspeaker. This can result in large movement of the cone  resulting in damage to the speaker. For this reason a useful multi function "spike suppressor" circuit is used.     First, two minutes after turn on the loudspeakers are connected. This prevents the the noise of the tubes warming up and charging of capacitors from reaching the speakers. During this delay a LED is blinking, when the LED stays constantly the loudspeaker is connected.  At turn off the supply voltage guard insures that the speaker is shorted. If  the amplifier is switched on immediately after switching off you must wait approximatly two minute for the amplifier to start playing. This safety feature protects the loudspeakers from unwanted spikes during warm up and turn off. 

Option: Input transformer E-1220 with mounting material 59.–– €