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The SumBus B Bus Partial Parts Kit is a collection of parts to add a 2nd stereo bus to a SumBus ACA mixer. This kit contains everything needed with the exception of (2) 2503 style quadfilar output transformers and (2) 2520 style discrete opamps. The output transformer is strapped 1:3 on this card so it must be a quadfilar design. This bundle is compatible with a SumBus16 or SumBus32 carcass. PS: DOA's can be added to this kit at the bottom of this page. Bundles with 2503-Litz transformers are available here. Bundles with EA2503 transformers are available here.