31:I[53470,["352","static/chunks/352-d982bf43a4fd8e87.js","4166","static/chunks/4166-8ca60d5be3e3329a.js","6874","static/chunks/6874-98a7f8268e192452.js","5784","static/chunks/5784-415ddf12556d8261.js","7399","static/chunks/7399-dff34d5dd349a4d3.js","3063","static/chunks/3063-7cbe9e548a8d185f.js","6164","static/chunks/6164-e17a771cf2d83f17.js","253","static/chunks/253-da62e547742b6bee.js","1215","static/chunks/1215-07120a8c77b23d78.js","5607","static/chunks/5607-9fccc14341fbf147.js","9164","static/chunks/9164-5de9886fbddf12ff.js","6252","static/chunks/6252-11d0c66f47fdb9a4.js","3204","static/chunks/3204-be90432f7d4d4f28.js","3470","static/chunks/3470-895a517adcd16c6c.js","4573","static/chunks/4573-7bdc349142f57f96.js","3357","static/chunks/app/(storefront)/(main)/categories/%5B...category%5D/page-9d5cd25a3f84346f.js"],"default"] 32:T40f,This is an upgraded Tube Kit designed to replace all of the tubes in your Mesa Boogie Triple Crown Head & Combos. It includes the upgraded SPAX7 preamp tubes as opposed to the standard 12ax7's.

The Triple Crown 50 Upgraded Kit includes:

2x MESA Matched EL34 Tubes - GC STR-447
6x MESA Premium SPAX7 Preamp Tubes (upgrade from 12ax7)
1x TAD 12AT7-ECC81 Preamp Tube - Premium Grade

MESA SPAX7 preamp tubes are a low noise super-premium grade substitute for any 12AX7 positions - They are a "Special Requirement Preamp Tube" that possess an even higher standard of overall performance, due to their incredibly low sensitivity to microphonic noise - This is the ultimate preamp tube to use in all critical gain stage positions - It is the absolute best of the best!

MESA BOOGIE TRIPLE CROWN TC-50

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Mesa Boogie Tube Kit, Upgraded, Triple Crown 50 Amplifier