The ET5 unfortunately eats tubes rather quickly. I haven't had one last more than a couple hundred hours. This includes tubes from CJ - the EH6922 and the Philips EC88. I believe they also offer Gold Lions which I have not tried.
I have also tried 2 NOS Siemens EC88's without much better results. It is a great sounding preamp but can be frustratingly noisy when the tubes begin to crap out. As a result I have had it in and out of my system and even keep the top cover unscrewed for easy access to swap in new tubes.
This has happened to other owners and I believe it has been documented in this and other threads.
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Main System
Basis 2200 Signature/Vector 4/Transfiguration Proteus
Ortofon Cadenza Black
Allnic H3000/CJ ET5/Mcintosh 501's
Thiel CS3.6
Thiel CS6
MIT EVO 2 IC
Straightwire Maestro II SC
Shunyata Denali SV2
Shunyata Sigma XC
Wywires Juice PC’s
Kubala Sosna PC’s
Dedicated 20 amp lines
Porter Ports
Arcici Ref Suspense Stand
Rives acoustically designed room 
Shore House
Basis 1400 Signature/Hadcock 228/Ortofon Jubilee
ARC PH 5/Meridian 200/Meridian 263 DAC
CJ Premier 14/Classe CA200/Thiel 3.6
Wywires Silver IC/Stereolab Diablo SC/MIT Z cord II
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