2:90 half drive noise problem, and version question

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eatsleeprock

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I've seen a lot of talk about blue light and red light 2:90s. Mine has a green light. Any thoughts on this?

Whenever I'm using half drive there is a low frequency bus on the volume knob (both channels, exactly the same) all the way to one o'clock, where is disappears, and is replaced with a hi frequency buzz. There is a very small sweet spot where it is almost as quiet as when not in half drive mode. I also find that when half drive is on, the power amp is not very responsive to preamp volume changes. Any help in this would be appreciated, as I live the sound of the mode.
 
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