Owner`s manual

5
Biasing your Slant 6V
The bias needs to be adjusted whenever the fixed-bias pair of 6V6s (inner pair of power
tubes) are changed. This is easy to do with a voltmeter:
1. With the new tubes installed, set the amp for half power, fixed bias, and turn it on.
2. Set the voltmeter to volts DC or millivolts DC (0.001 volt = 1 millivolt).
3. Locate the bias test points on the back panel, and plug the red lead of the voltmeter
into the red test point and the black lead into the black test point.
4. Locate the bias adjustment control on the bottom of the chassis near the power
transformer (on the left and toward the front if you are looking at the back panel–see
Chassis Diagram), and turn it left or right until the voltmeter reads 0.066 volts or 66
millivolts.
Please note the bias will vary a little bit as the amp warms up. Fluctuations in the AC line
voltage can also cause the bias to fluctuate–this is normal and not to be of concern.
If you do not feel comfortable making the adjustment yourself, take the amp to a competent
tech.
A note about changing power tubes: Replace power tubes with matched pairs of 6V6s.
The fixed-bias pair (inner pair) should be a matched set, and the cathode-bias pair (outer
pair) should be a matched set (see
Chassis Diagram). A more foolproof option is to purchase
a matched quad, which allows you to interchange tubes between cathode bias and fixed bias
sockets without fear of a mismatch. The Slant 6V can only use 6V6 power tubes.
Carr Amplifiers selects and tests the finest current production tubes specifically for each
amplifier model. Caution should be used when buying replacement tubes from any dealer
who does not have a return policy as all tubes can have problems (NOS tubes are
susceptible to microphonics and failure too).