midnightlaundry
Well-known member
Come in a get all nerd!
So I picked up a pair of EH EL34's from Upscale Audio because they have the "Best Matching in the business" for my Trainwreck Express build.. They burn in for 72 hours which is pretty cool.
I use the Eurotubes Pro One Bias Probe for biasing. So what I'm seeing is that on paper these tubes are pretty well matched, but according to the Probe, there's about a 4.5 ma difference between Tubes. The Bias Pot on my Amp is backed off all the way, so I can't get the higher Tube down to 43.7 ma's which is 70% dissipation.. 47.1 is about 75%, so it's not a deal breaker.
They added the Grid 2 current spec on there, so this must have a effect on why the 1 Tube pulls more current? Or did they just fluff on the match?
Thoughts?
So I picked up a pair of EH EL34's from Upscale Audio because they have the "Best Matching in the business" for my Trainwreck Express build.. They burn in for 72 hours which is pretty cool.
I use the Eurotubes Pro One Bias Probe for biasing. So what I'm seeing is that on paper these tubes are pretty well matched, but according to the Probe, there's about a 4.5 ma difference between Tubes. The Bias Pot on my Amp is backed off all the way, so I can't get the higher Tube down to 43.7 ma's which is 70% dissipation.. 47.1 is about 75%, so it's not a deal breaker.
They added the Grid 2 current spec on there, so this must have a effect on why the 1 Tube pulls more current? Or did they just fluff on the match?
Thoughts?