All materials used in the manufacturing of our tubes comply with the most stringent quality requirements.

In tube manufacturing, the fundamental requisite for the best production results is to maintain as high mechanical precision for assembly as possible. JJ Electronic uses assembly precision of no more than ? 0.02 mm.

  

Before they are assembled, all parts are thoroughly cleaned using such methods as the ultrasonic bath, chemical cleaning or annealing in an inert gas atmosphere (hydrogen, nitrogen).

   

A thorough inspection is performed on every component of the tube internal system before assembly. Assembled systems are then sent to sealing in a glass envelope. During the sealing procedure, the temperature of the glass pass-through joints must be controlled and joints are gradually tempered to relieve the inherent thermal stress.

   

Next, the assembled glass envelopes are evacuated by mechanical and diffusion vacuum pumps. During this process, the cathode emission coating is activated. All internal parts are heated by a high frequency heater and any spurious dust particles are evacuated. Finally, the getter rings are activated, while they absorb any residual gas inside the glass envelope of the tube.

Every tube is then electrically tested for all parameters which are the key to a flawless operation and a great sound. Specifically, these parameters include: leakage characteristics, internal vacuum level, cathode emission capability, filament voltage and current, anode current saturation level, microphony and others.