Run two Rectifiers.... One with EL34, the other with 6L6.
I ran my Tremoverb in multi-amp rigs on and off for 23 years. Just about any NMV amp is going to sound amazing mixed. I have tried more than half of the recommendations above and all them can work.
Getting control of phase issues and EQ in a multi-amp rig...specially with multichannel amps can be a pain in the @$$. For recording no big deal. Live endless problems. The biggest being getting the person controlling the mix to blend the amps the way you would want. It never happens.