User Manual

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20) SPEAKER OUTS
One 4 ohm, one 8 ohm and one 16 ohm jack are provided for speaker cabinet connections. Verify the impedance of your speaker
cabinet to make sure you connect it to the correct output.
21) TUBE MODE
This switch allows you to switch between the two tube operating modes, Pentode and Triode. Each mode has different power
outputs:
Pentode: 1 ÷ 40W (from 1W class A to 40W class AB)
Triode: 0,5 ÷ 15W (from 0,5W class A to 15W class AB)
22) BIAS switch (low/high)
The Combo Head 40 can operate in either Low Bias mode or High Bias mode. When this button is pressed in the power tubes work
in High Bias mode; when the button is depressed they work in Low Bias mode. In Low Bias mode, the tubes use less power and less
‘tube life’ is taken out of them. High Bias mode gives top quality and power, and higher-fidelity sound—but the power consumption
and dissipation of the tubes increases. In either mode, unlike other tube amplifiers, the Combo Head 40 is able to greatly prolong the
life of its tubes by keeping them optimally biased at all times.
23) SERVICE
The optional ATCS (Advanced Tube Control System) interface allows users or service technicians to connect this port to a computer—
and with dedicated software—collect technical data and tube parameters from the amp.
24) AC Power Socket
Make sure the unit is grounded; all three terminals of the AC power cord must be connected to avoid any injury to the user or damage
to the unit. DV Mark amps and combos are manufactured to be used in the country where they have been sold, and are factory preset
to that country’s voltage. So make sure you’re sending the correct voltage to your amp before you connect it to AC power.
REAR PANEL