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Look at the eico manual for the 147A on the BAMA website, it has a good description of the audio probe. Chinese sellers on eBay carry adapters to use banana plugs in pin jacks, it's how I connect things to my eico. You can easily make an audio probe out of stuff you likely already have Laying around, the main thing is it's well shielded, so that it doesn't act as a giant hum antenna.
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