Iasi- Don't try that sub unless you have a Llano amp, or get an OK from a tube expert. Llano amps have a unique design that allows this to substitution.
Difference between 12AU7 and 12AU7A
Anyone out there know what the difference between these two tubes is? All 9 pin mini dual triodes suppossedly can be rolled into the voltage amp stage of my Llano Trinity 300.