3.Maintenance. No user serviceable parts are to be found within the amplifier unit. Any maintenance or repair of the 1038A unit should only be undertaken by qualified service person- nel. Ensure that if fuse replacement is required, only fuses of the appropriate voltage and current ratings are used.
Figure 6. The upper curve group shows the horizontal directivity level' and 'bass roll-off' controls on the free field response. The curves characteristics of 1038A in its vertical configuration measured at 1m. to the right show the effect of the treble and midrange 'level' controls.
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