For my active speaker project, I need to build two 20W class-A stereo amplifiers without the preamps (Silicon Chip, May 2007). Unfortunately, Altronics does not supply the shielded 16V+16V, 160VA toroid transformer separately from the kit (K5125). Could you please indicate if I can use an 18V+18V 160VA toroid, or should I use a 15V+15V 160VA toroid?
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