Manley 50 WATT MONOBLOCK AMPLIFIER Owner's Manual

Contents

Manley 50 WATT MONOBLOCK AMPLIFIER Owner's Manual Manual pdf 7 page image

OPERATIONAL NOTESSWITCHING ONThe power switch is located on the lower left hand corner of the front panel. Push the top of therocker switch (1) to turn on the amplifier and the bottom of the rocker to turn off the amplifier. TheLED on the right side of the front panel will illuminate indicating that the amplifier is operating. Donot turn on and off the amplifier in rapid succession.RUNNINGIt is not recommended that you leave your amplifier permanently switched on. This only wasteselectricity and tube life. Your amplifier has solid state rectification and reaches peak operatingcondition in approximately 30 minutes.TUBE LIFEAs with all tubes, their quality degrades with age. This is due to cathode emission, a natural processfound in all tubes. We recommend that you have your amplifier checked every 3-4 years, dependingon usage, sometimes the amplifier will require re-tubing after this time has elapsed, although wehave many cases of extreme long life recorded-- 40,000 hours and still counting!.SPECIAL NOTEThe Manley 50 Watt Monoblocks are equipped with a voltage change-over switch located under thebottom cover. Insure that this switch is set at 110 if your mains voltage is 100,110,120, or 127Volts. Set this switch to 220 if your mains voltage is 220, 227, or 240 Volts.Changing the light bulb:The lamp which back-lights the Manley insert on the faceplate is a fuse-lamp style lamp. Should itburn out, turn off and unplug the amplifer from the mains first. Then remove the bottom cover.Carefully pry out the old lamp from its clips and replace with one of the same type. Although itlooks like a fuse, it is really a light bulb!! Don't put a fuse in there!!The fuse lamp is 1 1/4" x 1/4" 8Volts, 300mA.Fuses:Always replace with same type and rating. Should the B+ fuse blow (the fuse nearer to the outputbinding posts) this usually indicates a tube has blown. One should visually inspect the pcb to lookfor any burnt resistors a blown tube may have taken out. Also a good test is to measure the resistanceof each catode resistor. This is done in a similar fashion to checking the bias, except do this test withthe amplifier turned OFF, and set your meter for Ohms. Each cathode resistor should measure 10ohms.

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