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DO NOT Plug anything other than a speaker into a speaker jack--running a tube amp without a speaker can blow up the transformer quick (though not instantly), and feeding that power into the input of a second amp would probably have similarly detritious effect to that amp.
If I remember correctly, the BJr only has one input, so you cannot, as I think of it in my head, piggyback it to anything else. It could be the piggy-back-ee, but that's semantics as they work in my goofy cranium. As said--plug your guitar into your TR. Then, plug a second cable in next to the jack you just plugged your guitar into and run that cable to the input of the BJr...voila!
Now, I'm just wondering why you'd want to do that. Most people are simply looking for 'louder' by connecting several amps using the same guitar signal to drivethem all. But, it generally doesn't get much louder than a Twin (and if you need that I don't wanna be around), which is what raises the question. "Piggybacking" will run both amps at once--maybe what you really need/want is an A/B/Y box of some sort?
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