Core for Output Transformer

W0PWE
 

In the posts on boosting and/or leveling output power I often see pictures of a binocular core being used as the output transformer in place of the toroid that comes with the uBitx board. What size is that binocular core? I'm getting ready to order some toroids and would like to throw a couple of those on the order so I will have one for my scratch build. Thanks and 73
Jerry - W0PWE

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