The green wires are the 6.3 volt filament wires. It is connected to either of the T1-red-yel terminals, or to the standby switch if one is used. The red and yellow wire is the center tap for the high voltage winding. The center terminal on this connector is not used. They are connected to the terminals marked T1-RED. This circuit is connected to B+ and can not be used to power anything else. Make no other connection to these wires or terminals. They are connected to the terminals marked "T1-YEL". The yellow wires are the 5 volt rectifier filament winding. Most power transformers use this standard color code for the wires. The above diagram shows how to connect up the power transformer. The optional components (standby switch, rectifier switch, choke, supplemental capacitor, UL / triode switch, and CFB switch) can be used individually or in combination. I have added two diagrams as viewed from under the chassis at the bottom of this page. This is how everything would look if you were using above the chassis mounting. These are all shown as viewed from the top of the PC board. The following diagrams illustrate how the individual external connections to the PC board are made. Several popular hookup configurations for the completed amplifier are presented as well. Wiring for each external component is covered. In many cases this can be completed without soldering. This page contains pictorial wiring diagrams for the connections from the PC board to the external components.
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