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  JJ Electronic - Audio Tube Manufacturer

This famous brand of audio tube manufacturing, located in Slovakia, Europe, needs no special introduction. All members of the valve audio community know it very well (indeed some of us still use the 'JJ Tesla') from the past..

 

As the official website states : "In 1994, JJ Electronic started with the production of three types of tubes. Today, we offer an assortment of more than 20 types of tubes. In 1999, capacitors and tube amplifiers were added to the JJ Electronic manufacturing program."

 Despite the magic that internet-chatting and many audio 'specialists' say that makes a good tube, tubes are still designed and produced after strict engineering rules. In fact what really decides the outcome is whether minimal manufacturing tolerances can be applied or not.

Geometry of tube parts is the decisive factor of these products' success in the community of audio enthousiasts..

We quote again : "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.

Every month, random samples are taken from the production line in order to perform a life time test of 5000 hours under nominal conditions or 1000 hours at maximum specified ratings. "

 

 

Product List and Data

(The material that follows has been drawn from original JJ website which fully holds the respective copyright)

 

Preamplifier Tubes / Λυχνίες Προενίσχυσης   ECC81 / 12AT7 A.F.DOUBLE TRIODE Datasheet         ECC82 / 12AU7 R.F. DOUBLE TRIODE Datasheet         ECC83S / 12AX7 / 7025 R.F. DOUBLE TRIODE Datasheet         ECC803S/special spiral fil E83CC R.F. DOUBLE TRIODE Datasheet         ECC99 R.F. DOUBLE TRIODE Datasheet         ECC832 / 12DW7 COMBINED DOUBLE TRIODE FOR SPECIAL PURPOSES Datasheet         E88CC / 6DJ8 / 6922 R.F. DOUBLE TRIODE Datasheet         Power Amplification Tubes / Λυχνίες Ενίσχυσης Ισχύος   EL84 / 6BQ5 R.F. OUTPUT PENTODE Datasheet         7591S* R.F. OUTPUT PENTODE Datasheet         EL34 / 6CA7 A.F. OUTPUT PENTODE Datasheet         E34L A.F. OUTPUT PENTODE Datasheet         6V6S* A.F. BEAM PENTODE Datasheet         6L6GC / 5881 A.F. BEAM PENTODE Datasheet         7027 A.F. BEAM PENTODE Datasheet         KT88 A.F. BEAM PENTODE Datasheet         EL509* A.F. BEAM PENTODE Datasheet         300B A.F. TRIODE Datasheet         2A3-40W A.F. TRIODE Datasheet         Rectifying Tubes / Λυχνίες Ανόρθωσης   EZ81 / 6CA4 DOUBLE ANODE RECTIFYING TUBE Datasheet         GZ34 S / 5AR4 DOUBLE ANODE RECTIFYING TUBE Datasheet

Electrolytic Capacitors
Series TC,TE   Specs Doc	- Electrolytic Capacitors rated at 385 and 500 Volts. - Operating temperature range (-25) to (70)°C. - These capacitors have special features which enable them to excel in music industry applications.
Series MNH   Specs Doc	- Radial Snap-In Capacitors at nominal voltages 400V and 450V. - Temperature range (-25) to (+85)°C. - These capacitors feature long operating life span and high ripple current.

 

Tube Amplifiers

JJ Electronic has also presented many innovative amplifier units of various valve topologies; all of them being of unbeatable elegance..

More on these products on JJ's official website..

 

http://www.jj-electronic.sk

 

 

Having promoted the issue of 'valve audio' in Greece as a freelance writer in local magazines, MTZ audio founder Mr.M.Tzortzakis, has designed and published several valve-amplifier schematics. Many of them are based on JJ tubes and have their own share of success among the members of the greek audio DIY family..