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The SumBus B Bus High Nickel Bundle 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) 2520 style discrete opamps. 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. This bundle ships with 2503 High Nickel output transformers. Kits with EA2503s or Litz wire 2503s are also available.