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Although it's difficult to rate tubes without proper time, I am very happy with these Sovtek 6550WE's. They biased as a perfect match in My 1975 Marshall 50 watt and made the amp sound better than with the sacked out GT's that were in it. My only concern is that one tube glows brighter on the heater filament before the standby is turned on, no matter what socket it's in. Upon closer inspection I noticed it has two humps or "nodes" at the top as opposed to only one on the dimmer glowing tube. They were manufactured about two months apart so maybe its a MFG change that happened at that time. Still great sounding tubes.....so far.
