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Re: ARC VT-100 Mk III, now I'm confused

Posted by AbeCollins on December 31, 2005 at 13:54:25:
The VT 100 MkII had just ONE bias pot per four 6550 tubes. In other words ONE bias pot per channel for the power tubes.
The VT 100 MkIII one bias trimpot per TWO tubes. This doesn't give you an adjustment per tube but it's better than the MkII which gave you only one adjustment per four tubes. The two tubes should be matched pairs if possible.
You will need a digital multimeter and clip leads and a tweaker tool. The power tube bias adjustments should be fairly straight forward per the ARC Owner's manual.