Bias Voltage Adjustment - Pride Amp Series Service Manual

Pride DX300 CHAPTER 4

4.1 Bias voltage adjustment:

The following adjustment is from the factory manual you may want to do it another way.
The bias voltage should rarely need attention. If, however, the tube is changed or the adjustment is otherwise
disturbed, the following procedure should be adhered to.
1) Be sure the amplifier has been off for several minutes to allow enough time to discharge the power supplies.
Remove the bottom cover.
2) Place a jumper wire or clip lead from point (A) on the main circuit board to ground. Refer to pictorial for
specific placement of the jumper.
Figure 4-1 Jumper A
3) Replace bottom cover.
4) Place a 50ohm dummy load on the output connector of the amplifier.
5) Turn the unit on and allow it to warm for 60 seconds.
6) Place the TUNE/STANDBY/OPERATE switch into the OPERATE position and adjust bias control for a
reading of 35mA or .12V as read at the metering jack.
7) Turn off unit and allow it to discharge for several minutes before restoring it to normal configuration.
This completes the bias adjustment.
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