The 3CX1500A7/8877 power triode is used in the Alpha 77, 77D, 77Dx, 77Sx, and 9500. These are manufactured in China, shipped to our distributor, tested there, shipped to our factory in Boulder, and tested again - this time in an actual Alpha amplifier.  They are guaranteed for a full year.

*** OUT of STOCK *** The 3CX400A7/8874 is a compact high-mu power triode used in our Alpha 374, 374A, 76, and 78 amplifiers.  

The 3CX800A7 is a compact high-mu power triode intended used in our Alpha 86, 87A, and 89 amplifiers. These are genuine EIMAC tubes.

The 4CX1000A/8168 is a low voltage, high current tetrode is used in the Alpha 8410 amplifier.

The 4CX250B/7203 has a maximum plate dissipation rating of 250 watts and a maximum input power rating of 500 watts. The 4CX250B/7203 is designed to operate with a heater voltage of 6.0 volts.