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Pre-Amp Kit 2.0. DC in Output, Help

I am having some problems with my pre-amp.
Some years ago I assembled the Audio Note Pre-amp KIT 2.0, it was initially connected to a pair of Jeff Rowland Model 1 amplifiers, and worked fine. Later, I bought a BAT VK-55SE amp and it has been working fine for several months.
Today I replaced the BAT for one of the Rowland and every time I turn the amp on it instantly turn itself off, some kind of protection circuit I guess. When I connected directly my DAC (it has a volume control) to the Rowland, it works perfectly.
So, I disconnected the AN pre-amp from everything but the AC cable and I measured up to 2.0 DC volts from the outputs. I think it is triggering the Rowland protection circuit ???
Is it normal to have DC current from a Pre-amp output ? Why the BAT amplifier works ?

I appreciate any help.

Thanks

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Topic - Pre-Amp Kit 2.0. DC in Output, Help - J Corner 17:27:53 01/13/14 (8)
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