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These are great tubes if you buy from a good tube seller like I did. Also you can sub these for the much more expensive 5AR4/GZ34 the only difference is heater which 99% of the time doesn't matter (Nobody turn their amp on and plays dimed in the first 10 seconds.. that ll the heater does for you unless you're playing a outside gig at the norh pole.
Verified purchase: Yes
The EH tube was making a hissing sound. I am near my amp, so this is noticeable. The Sylvania's do not hiss, and look alot nicer. Try to get the ones with the ribbed plates.
Verified purchase: Yes
Verified purchase: Yes
The tubes are like new and function perfectly. I received them quickly as I live close by
Verified purchase: Yes
Sylvania made great tubes in the USA and this 5U4GB rectifier is no exception. If tested properly with adequate results, this tube should last years.
Verified purchase: Yes