Hum if using with Tube amp

Anyone using the TB with Tube amp? I got no problem with SS amp except Tube amp. Other devices don’t have problem with TB either until I hook up the TB. Very loud hum

Does your Tube amplifier have a coupling capacitor in the input?

I am not sure. Attached is the schematic
With Tube amp, no problem with CD, DVD, Phono

As shown in this wiring schematic, add a coupling capacitor to the amplifer circuit at the point indicated by the red arrow.

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Thank you, I will have to order the cap and try later