TAD KT88-STR
Our Favourite Tube in the KT88 / 6550 Class
The latest version of our TAD KT88-STR is built in the style of the early British MOV KT88. It has the same big and heavy glass envelope and beautifully polished metal base. Its wonderful tone and great appearance make this tube the most attractive choice for high-end audio applications and powerful bass guitar amps.
It offers a vivid and three-dimensional tone, pleasingly warm, detailed and with subtle highs. A very musical reaction, with great sound and finest details in mids and top-end; a linear and harmonious overall response with a very natural tone, make the TAD KT88-STR our favourite tube in the KT88 and 6550A class.
TAD Premium Selection
Q: When does a power tube become a Premium Selected power tube?
A: All power tubes labelled Premium Selected have passed the following tests:
- Plate Current (PC) and Amplification (TC)
- Low Noise Test
- Microphonic Test
- Sonic Test
- Shock Test
- Listening Test
- Shorts & Leakage Test
Premium RT-Matching of Power Tubes
Our Premium Matching is an exact matching of power tubes with identical Plate Current (PC) and Transconductance (TC).
| Electrical Characteristics | |
| Heater Voltage (AC or DC) | Minimum: 5.8 V, Nominal: 6.3 V, Maxium: 6.8 V |
| Heater Current | 1.6 A |
| Cathode | Oxide-Coated, Unipotential |
| Cathode-to-Heater Potential, Max. | 250 V |
| Direct Interelectrode Capacitance, Max.* | Grid No. 1 to Cathode and Grid No. 3, Grid No. 2, Base Sleeve and Heater: <17.0 pF / Plate to Cathode and Grid No. 3, Grid No. 2, Base sleeve and Heater: <12.0 pF / Grid No. 1 to Plate: <1.3 pF |
* Without external shielding, nominal values.
| Mechanical | |
| Operating Position | Vertical |
| Base | Octal, 8-Pin |
| Dimensions - Height | 114 mm (4.488”) |
| Dimensions - Seated Height | 103 mm (4.055”) |
| Dimensions - Diameter | 52 mm (2.047”) |
| Cooling | Convection |
| Approximate Net Weight | 90 g (3.17 oz.) |
| AF Power Amplifier Maximum Ratings | |
| DC Plate Voltage | 800 V |
| Grid No. 2 DC (Screen) Voltage | 600 V |
| Grid No. 1 DC (Control) Voltage | -300 V |
| DC Cathode Current | 230 mA |
| Plate Dissipation | 42 W |
| Grid No. 2 DC (Screen) Dissipation | 8 W |
| Plate + Grid 2 Dissipation | 46 W |
| Bulb Temperature (Surface Hottest Point) | 250° C |
| Typical Operatation - AF Power Amplifier, Class A1 (Single Tube) | |
| Plate Voltage | 400 V |
| Grid 2 Screen Voltage | 225 V |
| Grid 1 Control Voltage** | -16.5 V |
| Peak AF Grid 1 Control Voltage | 16.5 V |
| Zero Signal Plate Current | 87 mA |
| Maximum Signal Plate Current | 105 mA |
| Zero Signal Grid 2 Screen Current (Avg.) | 4 mA |
| Transconductance (Nominal) | 9,000 mS |
| Load Resistance | 6 kΩ |
| Output Power at 5% Distortion | 19 W |
** Approximate value (set to zero signal plate current).
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