The ECC83 should be next to the EL34, with the ECC82 in the back.... otherwise you will probably damage the tube and/or amp.
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My Octave V70se has ECC81 (12at7) as standard driver tubes. The manual states I can use either ECC81's or ECC82's. The ECC82 (12au7) has less gain than the ECC81's. So for grins I popped in a pair of ECC82's and I have more volume to play with. The overall top loudness stays the same but I can go higher on the volume knob with the ECC82's (not louder though) without adding noise and in fact sounds a bit better. When funds permit I'll try some different ECC81's.