JJ 6CA7 - PAIR

Product No.:: jj6ca7-pair
: In stock for immediate delivery.
Delivery time depends on the destination country*
Stock:: Pair
Weight:: 0.13 kg per Pair

53,00 €
26,50 € per Piece

incl. VAT excl. Shipping costs

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Description

2 tubes, matched as pair

The 6CA7 is a powerful power tube developed in the 1950s by General Electric (USA). It is electrically largely compatible with the European EL34, but more robust in construction and differs in sound behavior. Both tubes are electrically interchangeable. The 6CA7 offers an alternative sound color and more robust operation at high power due to its Beam Tetrode design. Those who prefer more headroom, warmth, and depth in sound often choose the 6CA7.

Technical Comparison: EL34 vs. 6CA7

Feature	EL34	JJ 6CA7
Tube type	Pentode	Beam-Power-Tetrode (beam power)
Socket	Octal (8-pin)	Octal (8-pin, identical to EL34)
Heater voltage (Uf)	6.3 V	6.3 V
Heater current (If)	approx. 1.5 A	approx. 1.5 A
Max. anode voltage (Ua)	800 V	800 V
Max. anode power dissipation (Pa)	25 W	25 W (partly more robust)
Screen grid voltage (Ug2 max.)	450 V	500 V
Amplification factor (µ)	approx. 11	similar, slightly higher
Construction	Slim glass envelope	Larger, wider envelope
Pin configuration	identical	identical
Sound character	„British“ – centered, assertive	„American“ – warm, powerful, round

Information about the manufacturer

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

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Probe Bias Octal, assembled

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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JJ ECC803 Selected GOLD

Sonically similar to the "normal" JJ 12AX7, but the overall sound is "fuller" and "stronger" with a more powerful bass. Visually, compared to the normal JJ 12AX7, the long anode plates stand out, as well as a slightly higher current. Suits well in guitar and bass amps, but also in audio and high-end areas.

All JJ gold preamp tubes are selected within a close tolerance and handtested for best sound and quality. Furthermore all pins are gold plated to achieve best electrical contact.
What about the sound? It is still the famous and well known JJ brownsound - warm and smooth.

Note: Tubes equipped with long plates are commonly associated with a "warmer" or "richer" sound, whereas those with shorter plates tend to deliver a "tighter sound". However, tubes featuring long plates exhibit increased sensitivity to vibrations and mechanical disturbances, rendering them less ideal for critical applications.

Files:

Datasheet

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