SAPPHIRES KT88 – SINGLE POWER TUBE (1 PC)
Cobalt Blue Glass Envelope
Ceramic White Base
Premium Golden Pins
Beam Power Tetrode KT88 / 6550
New in White Box
Amplitrex AT1000 Tested
Up for sale is a single (1 pc) high-performance Sapphires KT88 beam power tetrode vacuum tube, supplied in an individual white box. Featuring a stunning cobalt blue glass envelope, sturdy white ceramic base, and corrosion-resistant golden pins for superior electrical conductivity. Sapphires audio tubes are celebrated for robust output power, deep authoritative bass control, linear response, and exceptional dynamics. An outstanding choice for high-power audiophile tube amplifiers and guitar amplifiers utilizing KT88 or 6550 output tubes.
This tube has been fully tested on a precision Amplitrex AT1000 tube tester. Measured Plate Current (Ip in mA) and Mutual Conductance (uMhos) alongside percentage performance ratings relative to nominal factory reference specs (Reference: 140.0 mA / 11,500 uMhos) are detailed in the table below.
| Serial No. | Tube Section | Plate Current (Ip) | Mutual Conductance (uMhos) | ||||
|---|---|---|---|---|---|---|---|
| Ref Spec | Result | % Ip | Ref Spec | Result | % uMhos | ||
| SR.NO:5481001 | Single Power Tetrode | 140.0 mA | 107.3 mA | 77% | 11500 | 9670 | 84% |
Technical Note: Custom duties and taxes are the responsibility of the buyer in their country.
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