The tube quality in the GAT is much more critical than it is in the driver stage of an LP70, or any power amplifier for that matter.
Youve already dropped 20k on one of the worlds finest linestages, don't cheap out on a pair of tubes if you really want to get the maximum from your GAT. As this preamp has only been out dot a year, the handful of good NOS tube guys haven't had a lot of experience with it, so you may try a few things before you get the the exact sound you want.
The ET5 has passed the 500 hr point and switching to the EAT tube has made it quieter, more dynamic and slightly less grainy on the top end. As the ET5 is heavily based on the GAT design, I suspect you would have similar luck, provided the tube will fit.
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