Electronic Measurements SCR 20-80 Power Supply

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Hi,
Anyone have a schematic diagram for an Electronic Measurements SCR 20-80 power supply? I have one I use on my test bench that has stopped putting out DC voltage. If you can help out it would be greatly appreciated. This is my power supply for testing large power car amps. The problem is it's not turning on the SCRs that turn on the primary power transformer.
Thanks
 
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