Are MULLARD NOS EL34s and LTA ZOTL40 REF worth the price of admission?


I'm considering giving an older Linear Tube Audio (LTA) ZOTL40 Ref amp an audition.  LTA has a factory upgrade that includes upgrading to Mullard NOS EL34s for $800 (or less with additional discounts).  I am wondering if quad set of old-stock Mullard EL34s are worth the $800 price of admission?  I don't pretend to know what anyone else's budget is but $800 for quad EL34s seems like a lot.  If I'm paying the premium, it better be across the board and not just improvements on chamber music or obscure Chinese opera (no offense intended).  Does anyone have experience with either NOS Mullard tubes or LTA ZOTL40 Ref amp?  If so, please chime in.  Thanks.
128x128bananaslug
The nice thing about LTA is that, in that amp, those tubes should last you a life time... I have the ZOTL10 not the 40, but upgraded to vintage 6085s and 7062 in place of the 12AU & AT Xs in the line stage (from the two suppliers mentioned above, in fact--I second their recommendation): wonderful improvement that I do not regret paying for--about half what you would pay. It's a terrific amp either way: I simply wanted to give it the best.
I have used the Genalex Gold Lion KT-77 and thought that they were better than most all EL-34s
the mullard issues do not resemble the old stock ones in sound... whether the SQ difference is worth the extra cost is a function of one's wallet and system

but be sure, the difference is undeniably there
I agree with edi retro.
I bought a octet of NOS Mullard EL34 XF2s from Andy at Vintage Tube Services and I couldn't be happier. He is a wealth of knowledge when it comes to tubes and is glad to share his experience.

I agree with edi retro.
I bought a octet of NOS Mullard EL34 XF2s from Andy at Vintage Tube Services and I couldn't be happier. He is a wealth of knowledge when it comes to tubes and is glad to share his experience.