Absolare Hybrid Stereo Amplifier User Manual - Page 8

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6. Operating the Unit

Before turning on the Absolare Hybrid Stereo Amplifier, be sure that all tubes are

installed and all cables are connected securely.

After turning the Amplifier on, the power indicator LED on the front face plate will

start to blink. You will not hear any sound until the indicator LED stops blinking to

illuminate continuously which indicates all the capacitors are charged and internal

voltages are stabilized.

The Absolare Hybrid Stereo Amplifier will be ready to operate approx. 40 seconds

after turning on the power but attain full performance after 15 to 30 minutes.

There is a built-in thermal protection. If the output devices become too hot, output

power is reduced. It is heard as distorted sound.

Hence much of the voltage gain occurs in tube section, overall sound quality and

character is very dependent of the tube choice.

There is requirement for matching tubes to optimise performance. You can try

different types / brands of tubes in the left and right positions. The 12AU7 is a twin

triode tube, it is better to use tubes with closely matched internal triodes.

Selects the active input connection, XLR or RCA connector. The unselected input is

terminated with a 620Ω resistor.

You may hear a loud pop noise when switching capacitor coupled tube sources due

to DC charge/discharge currents.

position, gain switch attenuates the sound level by -6dB. This compensates

LOW

for actual pro-level balanced sources. It can also be used to enable wider volume

adjustment range with highly sensitive speakers.

The gain setting affects both channels equally.

ABSOLARE Hybrid Stereo Amplifier User Manual 1.2