JJ-Tesla KT88 Tubes

New product

254,10 €

Available for immediate shipping.


It has more power, a wider frequency response and dynamic range than any other KT88/6550 on the market. Gold plated control grid for improved fidelity. Specially designed heat dispersion wings on the plate add more performance, stability and allow plate dissipation up to 50 watts.

The new and improved JJ KT88 is the best-sounding current production KT88 according to a recent listening session. Very stable bias, handles high voltage well and sound fabulous! Why? Because is produced using the old original TESLA machines. Also works in most 6550 applications.

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

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JJ-Tesla KT88 Tubes

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  1. Salvo
    2019-04-16 17:15
    Buonasera rispetto al Sonic impact cosa ha di piu ii termini di qualità del suono?
    • PlayStereo
      2019-04-16 20:03
      Il Trends è un miglioramento però consideri che il chip di amplificazione contenuto all’interno è esattamente lo stesso, quindi la potenza non cambia. Alcuni parametri timbrici come la trasparenza, la raffinatezza, la completezza, migliorano, e questo miglioramento è tanto più percepibile quanto più l’intero sistema possiede una elevata qualità. Chiaramente se sta cercando una potenza maggiore l’upgrade non è consigliato.

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