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Learn to work Safe! |
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You have to understand how to safely work inside the chassis of a tube amp. Just reading this is not enough, read all links bellow; here are a few tips: Never work on a amplifier that is plugged into the wall socket, always unplug it first! Stand on a rubber mat of some sort or wood never on concrete and don't work bare foot, under the influence of alcohol or any other drug, legal or not for that matter. Here is another good tip: Only probe an amp with you're right hand and with you're left hand by you're side. So if you do happen to take a high voltage shock, the the voltage will not go across you're chest! Wear Protective Rubber gloves! High Voltage is stored in the electrolitic capacitors and they need to be discharged! That's what I'm doing in this pic. These are those large round can's and there usually blue or black. The discharge tool is made of 600 Volt wire with a 3-5 watt resistor of 500 to 1000 ohms. Basically you clip one side to ground then clip the other end to the Pos + side of the capacitor. If I have two cans as seen here then there are actually 4 capacitors 2 in each can, so I will take the time and clamp the discharge tool on all 4. Some cans can have more that 2 as well. Check with you're multimeter set to 600 DC volt setting and make sure the voltage has been fully discharged. Please read through these two Links:
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If you don't want to drill a hole then do as I did and remove the presence control.
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Put a resistor inplace of the presence pot to "fix" the presence level. With the pesence control pot removed, and the resistor in place. Its time for the B500k dual ganged PPIV Master Volume pot to take the presence pot place.
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You have to remove two stock capcitors first!I used cheap 20 gauge solid core wire, a alpha B500k dual gang pot, and .047uf Orange Drops. You can see where to connect everything its very easy! The solid core wire was great at keeping the wires spread a part from other components.
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