Gold AeroKT-99 output tubes, very rare,usedGold Aero KT-99 output tubes, very rare, 2 matched tubes, Amplitrex tested, Audio ResearchI have for sale two (2) Gold Aero KT-99 output tubes. As you probably know these tubes are rare and hard to find. The KT-99 is a drop in replacement for a 6550 and KT-88 tube. The KT-99 and KT-...130.00

Gold Aero KT-99 output tubes, very rare, 2 matched tubes, Amplitrex tested, Audio Research

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Condition
8/10
Payment methods
Ships fromSt. Paul, MN, 55122
Ships toUnited States
Package dimensionsunspecified
Shipping carrierUSPS
Shipping cost$9.95
AverageResearch Pricing

I have for sale two (2) Gold Aero KT-99 output tubes. As you probably know these tubes are rare and hard to find. The KT-99 is a drop in replacement for a 6550 and KT-88 tube. The KT-99 and KT-90 are the same tube.
These tubes are special tubes...they are labeled "engineering samples" and they are from the estate of an Audio Research employee. The tubes were test samples sent to Audio Research so they could evaluate the tubes...the tubes are 1990's vintage. Audio Research then went on the develop the V series of tube amplifiers that used this tube tube.
The tubes test as follows on a reference quality Amplitrex AT-1000 tube tester and with the excellent test results appear to have very low hours on them.
Here are the test results...111E/121GM 114E/113GM

Keep in mind when replacing output tubes, you have to re-bias your amplifier so make sure you have the skills to do that before buying the tubes.

The gold lettering is strong on all the tubes. The pictures have a lot of reflections in them due to the shiny glass and silver surfaces.

If you have any questions please email me before buying the tubes.

Continental USA sales only, The tubes will come packaged in the very nice tube shipping containers in the pictures.

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Return Policy

Return Window

Item can be returned within 7 days of receipt.

General Terms

Items must be returned in their original condition, with all included packing materials and no signs of use. Buyer assumes responsibility for all shipping return costs unless the item was not received as described.

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Buyer will receive a full refund in the original payment method less any shipping charges.

Special Conditions

7 day return for defective tubes.