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JJ 12AX7 / ECC83S Balanced

Description

TT Selection: Balanced
Both systems with balanced gain

Sweet and warm sounding preamp tube with high gain. We recommend this tube for guitar/bass amps.

Files:

Datasheet

Safety Information

Safety Information for Vacuum Tubes

For all electrical, electromechanical and mechanical components, the specifications and operating parameters arising from the respective type standard generally apply.
Further information, where available, can be found in the respective data sheets and product descriptions included with the product.

General Information

NOT SUITABLE FOR CHILDREN - choking hazard due to small parts
NOT SUITABLE FOR UNTRAINED PERSONS - danger to life due to high voltages
The safety and processing requirements applicable to the component must be observed
CE conformity applies only when installed professionally
Warranty becomes void in case of improper handling
The operator is responsible for proper installation
Local regulations and VDE provisions must be complied with
Never exceed the rated power
Never exceed the rated voltages and currents

Required Expertise

Use of measuring instruments (multimeter, oscilloscope) and evaluation of measurement results
Safe handling of high voltages (up to 500V and more)
Reading and understanding circuit diagrams
Selection of appropriate tools
Knowledge of electrical components and their characteristics
First-aid knowledge for electrical accidents
Knowledge of VDE regulations and safety requirements

Amplifier Tubes

Hazard due to high voltages
Hazard due to very high heat generation
Hazard due to glass breakage
Hazard due to UV radiation in case of defective tubes

Manufacturer

Herstellerinformationen | Manufacturer Information
JJ Electronic
A. Hlinku 3
022 01 ČADCA
Slowakische Republik
www.jj-electronic.com

Customer reviews (3)

Essential information about customer reviews We do not verify that the published reviews come from such consumers who have actually used or purchased the rated goods or services. All reviews, i.e. positive and negative, are published. No reviews that are unobjective, offensive or unrelated to the product will be published.

BENOIST, 04/26/2010

Bonnes lampes à plaques courtes (9mm), au gain modéré et équilibré. Utilisées sur un préampli / ampli casque Doge 6210 MK2 en entrée vers un Senheiser HD650 ou ampli de puissance Linn et enceintes triangle. Image sonore assez douce, aigus modérés, graves ronds sans être coulants. Ces tubes sont bien au dessus des 12AX7B chinois, en Hifi en tout cas. Version balanced obligatoire en hifi, merci Tubetown je n'ai pas trouvé de meilleur prix et prestations en France, livraison rapide de surcroit! HD650 ou ampli de puissance Linn et enceintes triangle. Image sonore assez douce, aigus modérés, graves ronds sans être coulants. Ces tubes sont bien au dessus des 12AX7B chinois, en Hifi en tout cas. Version balanced obligatoire en hifi, merci Tubetown je n'ai pas trouvé de meilleur prix et prestations en France, livraison rapide de surcroit!
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LAURENT, 01/10/2010

Très bonnes lampes de préamp, essayées sur un Marshall JTM30 en V2 et V3, avec en V1 une 12AX7 TT (V1). Idéal pour un son clean, on retrouve le son des lampes d'origine (ECC83). Je recommande Tube Town aux clients Français, car ils ont le mérite de proposer de très bons prix, un service de qualité, un bon délai (commande reçue 5 jours aprrès l'avoir passée, colis très bien emballé et plutôt bien traité). Les frais de port sont corrects si on passe une commande groupée, mais vu les prix des lampes en France ils sont vite amortis. Il manque juste des specs plus détaillées sur certaines vieilles lampes pour connaître la puissance ou la tension max, mais on les retrouve facilement sur le net. Autre point positif, ils mettent à disposition des guides de choix de lampes lampes en fonction du son recherché, et un très bon guide sur le réglage du bias (en anglais). des lampes d'origine (ECC83). Je recommande Tube Town aux clients Français, car ils ont le mérite de proposer de très bons prix, un service de qualité, un bon délai (commande reçue 5 jours aprrès l'avoir passée, colis très bien emballé et plutôt bien traité). Les frais de port sont corrects si on passe une commande groupée, mais vu les prix des lampes en France ils sont vite amortis. Il manque juste des specs plus détaillées sur certaines vieilles lampes pour connaître la puissance ou la tension max, mais on les retrouve facilement sur le net. Autre point positif, ils mettent à disposition des guides de choix de lampes lampes en fonction du son recherché, et un très bon guide sur le réglage du bias (en anglais).
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Bias probe for indirect measurement of quiescent bias current of a tube. The adapter is inserted between the tube and the socket and gets connected to a standard voltmeter (not included). Pay attention to the quality of the measuring device and sufficiently charged batteries!

The quiescent current is measured indirectly via a precision resistor integrated in the adapter. The advantages of this measuring method are harmless voltages at the measuring plugs, which are in the mV range, as well as short ways for the current, since it does not need to be fed through the measuring device (common practice with many measuring adapters of Far Eastern production). As a result, there is no risk of oscillations of the amplifier which can lead to possible damage of the tubes or the amplifier itself.

Note: This adapter cannot be used when additional tube brackets are installed. These must be removed before using the measurement adapter and reattached after the measurement is complete.

Procedure for the measurement

Determine the resistance of the adapter, including the measuring leads. To do this, connect the adapter to the meter, but do not plug it between the tubes and the amplifier, yet. Select the measuring range “Ohm” on the meter and note the measured value, e.g. 1,1 ohms.

For the final measurement insert the adapter between the tube and the currentless amplifier and connect it to the meter, select the measuring range mV and switch on the amplifier. When the amplifier has reached a stable operating condition, read the value in mV from the meter and calculate the quiescent current based on Ohm's law.

Example:
measured voltage = 47 mV, resistance of the adapter = 1,1 ohms.
Formula (I = U / R) or in this case:
bias current (in A) = measured value (voltage in V) / measured value (resistance in ohm)
0.047V / 1.1 ohms = 0.042A or 42mA respectively

For the calculation of the correct bias current as well as further information on the bias measurement, please refer to further documents or the bias setting instructions in the info area, as well as the manual of the amplifier itself.

This measuring adapter is suitable for all EL34, 6L6, 6550, KT88, 6V6, 6CA7 and other tubes with the same pin layout.

Attention high Voltage! Measurements and work on tube amplifiers should only be carried out by qualified persons.

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