Triad M-12AL Multi-Match Modulation Transformer 4000 Ohms to 20,000 Ohms 125 Watts Audio 300 mA Max DC Primary and Secondary Method  of matching any primary impedance to desired secondary impedance. 1. The primary impedances are noted after the primary connections. These impedances should be selected as recommended by the manufacturer of the modulator tubes. Be sure all leads not being used are well insulated. 2. To determine the secondary impedance, divide the final plate voltage by final plate current. Sec Z = Vp/Ip 3. After impedances are determined, read down from the primary impedance column to the proper secondary impedance, and then left for the leads to be used. Examples: 4000 Ohms  primary impedance and 6250 Ohm secondary impedance, use Black/Red and Blue/White secondary leads. PRIMARY CONNECTIONS IMPEDANCE Yellow Leads to Mod Plates Tie Red Leads to B+ 7100 7450 8480 8860 10600 12400 14200 15800 17700 20000 Tie Blue Leads to B+ 4000 4200 4760 5000 6000 7000 8000 8900 10000 11200 USE SECONDARY LEADS: RED/BLUE & GREEN/WHITE 10000 10500 11900 12500 15000 17500 20000 BLACK/RED & GREEN/WHITE 9000 9450 10700 11250 13500 15750 18000 20000 BLACK/YELLOW & GREEN/WHITE 8000 8400 6520 10000 12000 14000 16000 17800 20000 RED/BLUE & BLUE/WHITE 7100 7450 8480 8860 10600 12400 14200 15800 17700 20000 BLACK/RED & BLUE/WHITE 6250 6550 7440 7800 9350 10900 12500 13850 15600 17500 BLACK/YELLOW & BLUE/WHITE 5450 5700 6480 6800 8150 8650 10900 12100 13600 15250 RED/BLUE & BLACK/GREEN 4720 4950 5620 5900 7100 8260 9450 10500 11800 13150 BLACK/RED & BLACK/GREEN 4000 4200 4760 5000 6000 7000 8000 8900 10000 11200 BLACK/YELLOW & BLACK/GREEN 4000 4200 5050 5880 6700 7460 8400 9350 TNX to Rick - W3RSW for the info.

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11 April 2010