What you're describing is biamplification. What kind of speakers do you have? You'll need a speaker system capable of separating the HF from the LF drivers, and not all speaker systems offer that.
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What you intended to do is passive horizontal bi-amping, if using two different stereo tube amp, you need a volume control for gain matching if both amp has different gain.
If both stereo tube amp are identical, vertical bi-amping is better, you can use one amp to drive Right speaker tweeter and woofer, use the other amp to drive Left speaker.
A 'Y' interconnect cable should work in most case.
Hi Thanks to you all .
Yes exactly the same Amps with single volume control each > going to Biwire WHARFEDALE REVA 3 speakers .
Its actually the better halfs choice , she says the long tv unit looks unbalanced with the single valve amp at the left hand side .
Yes I know Im weak .
As I say many thanks to you all for your help/advice . Tilt