A quad of the rare EI branded KT90's type 3's these are reliable..and play strong. Never any overheating probs like some were prone to, They have passed the QC test. ..........approx. 3 or 400 hours on them, much life left in these puppies!
They are a real step up in performance over most KT88 - 6550 type tubes $ 150.00 & shipping. These went for 75-90 a piece when they were still available.
Ei KT90's
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ship from PA. PO money order is preferred but PP is possible w added fee.
Tung-Sol 6550's $75.00 & shipping
