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Depends on how exactly you are making that conversion and where you are puting things. The difference between the channels on a 5f6a amounts to one .0001uf coupling cap on the bright channel. Each channel uses half a triode and they share two halves of a triode after joining. I'd have to see a schematic of how you are wiring things up to tell you how what was posted would affect things. What you want to do is make sure that .0001 cap on your bright channel occurs before you combine the channels; i.e. before the wire that is added in the mission mod or moved in the Torres mod.
As for using a solid state rectifier, a few things are going to happen. Your b+ will go up all through the amp. Since 6v6s are already over spec in a DR, I'd definitely NOT do that with 6v6s, it may be ok with 6L6s but then you are hitting that impedance mismatch in the primary of the OT again...... Also, your b+ will come on FAST and spike when it comes on, which can be a problem if you have any weak components, its likely to stress them and may cause failure, maybe catastrophic failure. This is especially true on a DR if you are using the stock filter cap configuration (even with brand new caps) because they wire 2 16uf caps in PARALLEL, which gives you 32uf BUT DOESNT double the voltage handling capacity. If you are using 500v caps, and even moreso with lower voltage caps, this can definitely over stress the caps and cause catastrophic failure, taking tubes and output transformer along for the ride. If you MUST install a solid state recto in a DR, change the wiring on the first two filter caps to the standard higher wattage two-caps-in-series with 220k resistors across both to even up the voltage handling. If you use two 80uf or 100uf caps, this gives you 40uf or 50uf but the voltage handling of both caps adds, so you would get 800v handling capacity out of two 400v caps, which should be more than enough.
A GZ34 ramps up slow, which protects components, and many prefer the sound (softer, more 'bloom') of the tube rectifier. If you change your filter cap circuit to two 100uf caps in series, you can still switch back to the GZ34 (you'll have to rebias). You want to be careful how much capacitance you have in the first section after a tube rectifier, but 50uf is fine for a GZ34 (though it might be too much for other rectifier tubes).
Overall, my recommedation would be to NOT put a solid state recto in a DR, but if you just have to have one, you should definitely do the change I mentioned above or you are asking for trouble.
As for using a solid state rectifier, a few things are going to happen. Your b+ will go up all through the amp. Since 6v6s are already over spec in a DR, I'd definitely NOT do that with 6v6s, it may be ok with 6L6s but then you are hitting that impedance mismatch in the primary of the OT again...... Also, your b+ will come on FAST and spike when it comes on, which can be a problem if you have any weak components, its likely to stress them and may cause failure, maybe catastrophic failure. This is especially true on a DR if you are using the stock filter cap configuration (even with brand new caps) because they wire 2 16uf caps in PARALLEL, which gives you 32uf BUT DOESNT double the voltage handling capacity. If you are using 500v caps, and even moreso with lower voltage caps, this can definitely over stress the caps and cause catastrophic failure, taking tubes and output transformer along for the ride. If you MUST install a solid state recto in a DR, change the wiring on the first two filter caps to the standard higher wattage two-caps-in-series with 220k resistors across both to even up the voltage handling. If you use two 80uf or 100uf caps, this gives you 40uf or 50uf but the voltage handling of both caps adds, so you would get 800v handling capacity out of two 400v caps, which should be more than enough.
A GZ34 ramps up slow, which protects components, and many prefer the sound (softer, more 'bloom') of the tube rectifier. If you change your filter cap circuit to two 100uf caps in series, you can still switch back to the GZ34 (you'll have to rebias). You want to be careful how much capacitance you have in the first section after a tube rectifier, but 50uf is fine for a GZ34 (though it might be too much for other rectifier tubes).
Overall, my recommedation would be to NOT put a solid state recto in a DR, but if you just have to have one, you should definitely do the change I mentioned above or you are asking for trouble.
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