I've tried several tube changes with my Line-3 (NOT the SE model), and I think the single largest improvement was the replacement of the 6922s at position LV1 and V2 with Amperex JAN 7308s. I am not sure what the SEs have in those two positions, but this change was recommended by Kevin at Upscale Audio. My system was a little too bright in the high-mids, which the 7308s brought under control somewhat. Related equipment: Rowland 8TiHC and Aerial 10ts.
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