[billerb1]

I am a Woo Audio WA2 amp owner. Been blown away for the past couple of months using a pair of Telefunken ECC801s as my driver tubes. You need 12AT7 to 6922/E88CC adapters to use 12AT7's in the WA2. Great synergy with my GEC 6AS7G's power and Marconi U709 rectifiers.
Along those lines I've read that GEC A2900's are the absolute premier 12AT7 type tube...but that it has a higher amplification factor than others in the 12 AT7 family, 70 amp factor for the GEC vs 60 for a 'normal' 12AT7. Has anyone here tried them with the WA2? Are they compatible or might they cause damage to the WA2 ???
Would appreciate any input.
http://tdsl.duncanamps.com/pdf/a2900.pdf

 

[Tom-s]

I've tested these tubes. And they test close to a normal 12AT7 to be equal.
What is important with these, is that you are very aware they have a higher filament current draw.
Normal 12AT7 is 0.3A, A2900 is 0.4A
WA 2 has 1 amp max for the driver tubes. So it will work perfectly with 2x 400mA -> 0.8A driver current.