Bluetooth sender from Amp to P100 headphones

Hello, I have a pair of P100 headphones that I generally use with my Android phone over Bluetooth. I would like to be able to connect them to my ageing Linn Pre-Tek and Power-Tek (preamp and amp) setup via Bluetooth. Ideally, I would like something that would work from the Tape Output on the pre-amp.

Can anybody recommend a suitable tape-out/line-out to Bluetooth transmitter that would do the job please?

I see several items on Amazon that claim to be able to do the job but they all look a bit suspect !!

Thanks Ernie

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