Vintage Ei KT90 quad plus one spare (5 tubes). Vintage Ei KT90 matched quad. All with the type 2 heavily spot welded plates and silver tab w/black square. Most say that this rare version of the Ei KT-90 is the best sounding. ONE TUBE HAS MISSING GUIDE PIN. I HAVE MARKED THE GUIDE PIN LOCATION. Made in the former Yugoslavia. They have welded gray plates and dual O getters. I will throw in a free extra spare KT90 as a backup. Shipped in plain white boxes.Tested on a Jackson 648 tester. Results for the quad: 120 (missing guide pin)/115/110/100. 100 and above is NOS. Spare free tube tests 70 which is minimum for this tube type. Printing on quad: two very good, one good, one faint (see photos). $600 for the quad plus one (5 tubes). Price includes all US paypal fees and USPS Priority shipping to the continental USA. Questions are welcome. Canadian customers: Please add $40 USD to cover additional shipping and PayPal costs. No matter how secure the packing, the less time 50+ year old tubes spend bumping around in transit, the better they will sound when they reach you. My best experiences sending tubes to Canada in these times have been USPS Priority International shipping. It costs more but your tubes will arrive safely and in a reasonable amount of time. 6-10 days. You will also get $200 USD insurance included in this price. Thank you for your understanding.
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