Now before I start my review on this product I am no expert when it comes to tube amps I have only started to dive into this world for the past 3 years so still new at it so my own knowledge is my ears.
When I put these EL34 into my marshall TSL 601 I noticed that the overdrive tone became a bit more noticeably warmer at lower volume but at high volumes this is when this tube start to shine you start to get that gnarley classic British tone but with slightly more definition to your attack so if you're running a 100 watt tube amp maybe getting an attenuator would be worth an investment to get the best tone out of these valves.
The build quality seems good a nice feature is that they have the pins number so when placing the into your amp you know exactly where to put them which is a great feature.
Now these tubes are still some what new only got about 25 hours of play put into them but they seemed to have broken in relatively fast I don't know if that is a good thing or not but I am happy with the tone.
pros solid construction numbered pins more definition in tone
cons you need to push the valves to get the best tone the tone is not too good at lower volumes (but what amp is)
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