Gold plated control grid for improved fidelity.
This tube is as close to an NOS Mullard as you can get although I have to given mention to the Svetlana EL34. It’s very good the way the JJ tubes break up better. They are very smooth and have the biggest low end of any current production EL34. The JJ E34L is the right choice for most applications simply because of it's extended low end and the fact that it's tighter and punchier.
We now stock the new super-high quality JJ audio tubes. These tubes have consistently outperformed the competition in tone and sonic performance. Quality is the best we have seen from this factory.
Also available on demand 8, 12 and 16 selected tubes. Contact us.
JJ Overview
JJ Electronic was formed in 1993 out of the privatization of Tesla company. It is located in the heart of Europe, in the Slovak Republic. With over 25 years of experience in development and manufacturing of electron tubes, our staff is ready to meet the demands of today`s HI-FI and music instruments markets. JJ ELECTRONIC manufactures tubes on proven Tesla equipment modernized with the latest technology.
JJ Testing
Every tube is electrically tested for parameters such as isolation characteristics, the electrode's current levels covering the entire operating curve, the condition of the vacuum, cathode emission capability, filament voltage and current levels. A microphonic test is performed on every tube. All tubes are then further burned-in for a period of 24 hours at the nominal specified operating voltage and current levels. Every month, a random sample is taken from the production to perform a life test of 5 000 hours at nominal operating conditions or 1000 hours at maximum specified levels.
Information on tube matching
Test 6CA7
Premetto che ero perplesso sulle recensioni lette in merito a questo tipo di valvola ed ho deciso di testarla personalmente. L'amplificatore dove ho provato la 6CA7 è un Unison Research simply two con EL34, abbinato a B&W 703. Nulla da eccepire riguardo le EL34 sempre JJ (testate anche Svetlana), cercavo però un suono leggermente meno marcato negli alti traslando la gamma leggermente verso il basso. In effetti le JJ 6CA7 hanno questa caratteristica, nel caso specifico del mio impianto la gamma alta è migliorata, meno penetrante ed i bassi sono controllati ma più profondi. Confermo perciò la validità del prodotto, sicuramente positivo nel mio caso, consiglio però un rodaggio di almeno 10/20 ore per apprezzare al meglio il suono che inizialmente risulta un poco ovattato.
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