Here's how to assemble the Nomad Radio Heavy-Duty High-Voltage power-supply board for the Pride DX-300 base amplifier.


The first  step is to unpack the components and make sure you have them all. We don't make many mistakes in packing the kit, but now is the time to make sure that you have everything that you need.
 
The package should include all the parts in the picture below. Specifically:
All 42 Parts lined up

Uh, seven bleeder resistors? The board only has holes for six resistors. The seventh one is to drop onto the shag carpet, never to be seen again. Likewise, there is room only for 24 rectifiers. We include 26 of that part because the leads are pretty stiff. If you break two of them while bending the leads, there will still be enough of them to complete the job. The rest of the parts are big enough and stout enough that you probably won't break or lose them.

Cut the leads at the tape's edge, leaving them long.

Next you need to clip the rectifiers loose from the tape. Leave the leads long enough that they won't be tricky to bend. I should consider bending them before we pack the kit. That way you wouldn't need to. It's a pain in the neck. Or in the fingers.

Both leads bent parallel, spaced 9/16" apart.

Next, bend the leads parallel on six of the 240k 2-Watt bleeder resistors.
Bendh all six bleeder resistors' leads parallel
Insert them into the UNDERSIDE of the board, BENEATH the spot printed on the top side of the board. .
The Bleeders go on the bottom side of the board.

Solder the resistor leads to the board, then clip all twelve bleeder-resistor leads as flush to the board's surface as you can.

Cut the resistor leads flush to the surface of the board's TOP side.

Next come the rectifier diodes. If you are qualified to install this thing, then I don't have to explain that the white band at one end of each rectifier is the cathode. That end of each rectifier goes to the SQUARE hole, the other (no band) end goes to the round hole for each diode outlined on the top side of the board.

The banded ends go into the square holes.

You are welcome to do this in any sequence you like, but I have a suggestion for keeping the rectifiers all pointed in the right direction. IF YOU GET ONLY ONE OF THEM BACKWARDS, IT WON'T WORK RIGHT. Guaranteed..

First, insert only the twelve rectifiers that point to the right. That is, the ones with the banded end (and the square hole) on the right-hand side.

Insert half the rectifiers first, the ones that point to the right.


As you insert each one, bend the leads sticking out the bottom apart at about a thirty-degree angle so they won't fall out when you turn the board over later to solder them.

Bend the leads away from each other on the underside of the board.

Now insert the other twelve rectifiers, the ones that point to the left. This is a good time to insert the two 5-ohm 5-Watt resistors, also.

Now insert the other twelve that face to the left.

Make sure that you bent all 52 lead wires outwards so they won't fall out of the board, and turn it over to solder them.

With all 52 leads bent outwards, turn it over and solder them.The banded ends go into the square holes.


Once you have soldered all 52 leads and clipped off the excess, it's time to insert the six electrolytic filter capacitors.

Each one has a white stripe along one side, and a minus sign (-) printed on that side.

The negative pin is marked with a minus sign

This pin on the capacitor goes to the ROUND hole at each position. Just for good measure, there is a white "-" printed alongside the round hole for each filter cap.

Each round hole also has a white minus sign next to it.The negative pin goes to the round hole.

The pins on these capacitors are bent so that they will "snap" into place, and prevent them from falling out when you turn the board over to solder them in. Here's how they look, all six turned around the right way. Take a moment to compare here, before you solder them in. IF YOU ONLY GET ONE OF THEM BACKWARDS, IT WON'T WORK RIGHT. Guaranteed.

They should look like this when they are in place.

Now solder all twelve filter-capacitor pins. The board is now ready to install.


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