Cayin Jazz 70 is a tube integrated amplifier designed to combine an EL34 analog circuit, two operating modes and a complete Bluetooth section in a single device. Belonging to Cayin’s Jazz class and presented as the entry-level model in the line, it uses four EL34 power tubes in a Class AB1 push-pull configuration and three 12AU7/ECC82 tubes in the preamplifier stage. The equipment also includes three LINE analog inputs, a Bluetooth input, a headphone output and terminals for 4 or 8 ohm speakers.

EL34 tube amplifier with push-pull circuit

The heart of the Cayin Jazz 70 consists of four selected and matched EL34 tubes used in the power stage. The Class AB1 push-pull configuration is the central element of the amplifier’s architecture, while the preamplifier uses three 12AU7 tubes, also identified by the ECC82 designation. This combination defines the device’s tube-based design and allows the user to choose between two operating modes: Triode and Ultralinear.

In Triode mode, the Jazz 70 delivers 17 W + 17 W RMS. When Ultralinear mode is selected, the available power rises to 35 W + 35 W RMS. The two options therefore allow the amplifier’s operation to be adapted to listening preferences and system context, without changing the device’s general configuration. The mode is selected directly on the amplifier and distinguishes two operating settings clearly indicated by the manufacturer.

Construction and components

The Cayin Jazz 70 features point-to-point wiring. Power is supplied by a hand-made toroidal transformer characterized by low magnetic leakage. EI transformers with a wide frequency response are used for the output. These elements form part of the amplifier’s technical structure and accompany the EL34 tube section in an integrated design intended for use in HiFi systems.

The tubes are protected by a removable metal grille. The protection can remain installed during use or be removed when visual access to the tube section is desired, always taking into account the necessary precautions related to the presence of hot and powered components. Two dedicated instruments are present on the front panel for displaying, adjusting and monitoring bias. This equipment allows the bias to be checked directly on the device, without confusing this function with a simple aesthetic indicator.

The front panel is available in black or silver. The appearance combines the front instruments with the visible tubes and removable protective grille, maintaining a recognizable setup for a tube amplifier in the Jazz series. The declared weight is 15.6 kg, while the dimensions are 300 × 338 × 190 mm.

Bluetooth connectivity and analog sources

In addition to the tube section, Cayin Jazz 70 offers an integrated Bluetooth input. The wireless connection uses Bluetooth 5.1, a Qualcomm QCC5125 chipset and an ESS ES9018K2M DAC. The device name displayed during pairing is Cayin HD BT. The declared range reaches up to 10 meters under conditions compatible with normal wireless-connection operation.

Bluetooth supports LDAC, aptX HD, aptX LL, aptX, AAC, MP3 and SBC formats. The presence of multiple formats allows different Bluetooth sources to be used, naturally verifying the format actually available according to the transmitting device and its settings. The Jazz 70 can therefore be integrated into a system in which music is also played from Bluetooth-enabled devices, without requiring a dedicated analog connection for this source.

For wired sources, three RCA analog inputs are available, identified as LINE 1, LINE 2 and LINE 3. This configuration allows several analog devices to be connected to the amplifier and the desired input to be selected according to the source in use. The input has a sensitivity of 380 mV and an impedance of 100 kOhm. Bluetooth is listed separately among the inputs, alongside the three LINE connections.

Speaker connection and headphone listening

The Cayin Jazz 70 has speaker outputs for 4 ohm and 8 ohm speakers. Before connection, it is important to choose the terminal corresponding to the nominal impedance of the speakers being used and to follow the system installation instructions. The amplifier is therefore prepared for integration with speakers matching these two declared connection values.

A headphone output compatible with models having an impedance between 16 and 300 ohm is also provided. This makes it possible to use the Jazz 70 both as a speaker amplifier and as a personal listening point, by directly connecting headphones within the indicated range. The declared compatibility concerns impedance; the specific characteristics of the headphones and individual preferences may nevertheless affect the listening experience.

Main technical data

• Type: EL34 tube integrated amplifier.
• Preamp tubes: 3 × 12AU7/ECC82.
• Power tubes: 4 × selected and matched EL34.
• Circuit: Class AB1 push-pull.
• Operating modes: Triode and Ultralinear.
• Power in Triode: 17 W + 17 W RMS.
• Power in Ultralinear: 35 W + 35 W RMS.
• Frequency response: 8 Hz – 60 kHz, -3 dB.
• Harmonic distortion: 0.2% at 1 W/1 kHz; less than 5% at rated power.
• Signal-to-noise ratio: 100 dB, A-weighted.
• Inputs: LINE 1, LINE 2, LINE 3 and Bluetooth.
• Speaker outputs: 4 ohm and 8 ohm.
• Headphone output: for impedances from 16 to 300 ohm.
• Bluetooth: version 5.1, Qualcomm QCC5125, ESS ES9018K2M DAC.
• Dimensions: 300 × 338 × 190 mm.
• Maximum power consumption: 240 W.

A complete configuration for the HiFi system

The Cayin Jazz 70 combines the preamplifier section, EL34 power stage, Triode and Ultralinear selection, analog inputs and Bluetooth connectivity in a single chassis. This setup avoids the need to add a separate amplifier to manage LINE sources or wireless playback. The three RCA sockets allow wired sources to be organized, while Bluetooth adds a cable-free connection supporting several formats.

The ability to connect 4 or 8 ohm speakers and 16 to 300 ohm headphones expands the device’s possible uses. The dual front instrument, removable metal grille and point-to-point construction complete an equipment package that keeps the project’s tube-based nature visible, with technical data defined for power, connections and operation.

Installation and use

To configure the system, connect the speakers to the 4 or 8 ohm terminals corresponding to their nominal impedance, select a source from the LINE inputs or pair a Bluetooth source by identifying the device as Cayin HD BT. Triode or Ultralinear mode can be selected according to usage requirements. Bias monitoring is performed using the two front instruments and must be carried out according to the procedures intended for the device.

With dimensions of 300 × 338 × 190 mm and a weight of 15.6 kg, the Jazz 70 requires a stable surface suitable for amplifier ventilation. The removable metal grille protects the tubes, but does not eliminate the need to pay attention to the temperatures reached during operation. The declared maximum power consumption is 240 W.

Main features

• Operating modes: Triode, Ultralinear
• Inputs: LINE 1, LINE 2, LINE 3, Bluetooth
• Signal-to-noise ratio: 100 dB, A-weighted
• Input impedance: 100 kOhm
• Maximum power consumption: 240 W
• Analog inputs: 3 × RCA

Technical specifications

Main device/unit technical weight	15.6 kg
Operating modes	Triode, Ultralinear
Inputs	LINE 1, LINE 2, LINE 3, Bluetooth
Signal-to-noise ratio	100 dB, A-weighted
Input impedance	100 kOhm
Maximum power consumption	240 W
Analog inputs	3 × RCA
Bluetooth chipset	Qualcomm QCC5125
Supported Bluetooth formats	LDAC, aptX HD, aptX LL, aptX, AAC, SBC
Bluetooth DAC	ESS ES9018K2M
Bluetooth device name	Cayin HD BT
Supported Bluetooth formats	LDAC, aptX HD, aptX LL, aptX, AAC, MP3, SBC
Bluetooth range	Up to 10 m
Bluetooth version	5.1
Circuit	Class AB1 Push-Pull
Circuit configuration	Class A/B push-pull
Construction	Point-to-point wiring
DAC	ESS ES9018K2M
Device type	EL34 tube integrated amplifier
Dimensions	300 × 338 × 190 mm
Distribution	Cayin Audio Distribution GmbH
Frequency response	8 Hz – 60 kHz (-3 dB)
Front instruments	Dual instrument for bias display, adjustment and monitoring
Headphone output	For headphones with impedance from 16 to 300 Ohm
Headphone output compatibility	From 16 ohm to 300 ohm
Input sensitivity	380 mV
Manufacturer	Zhuhai Spark Electronic Equipment Co. Ltd.
Maximum power consumption	240 W
Output power in Triode mode	17 W + 17 W RMS

Technical insights

The specifications provided help compare the product’s configuration, compatibility and performance.

Related products

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Frequently asked questions

Which tubes does the Cayin Jazz 70 use?

The Cayin Jazz 70 uses three 12AU7/ECC82 tubes in the preamplifier stage and four selected and matched EL34 power tubes.

What is the power output of the Cayin Jazz 70?

Power is 17 W + 17 W RMS in Triode mode and 35 W + 35 W RMS in Ultralinear mode.

Which sources can be connected to the Cayin Jazz 70?

Three RCA analog inputs are available, identified as LINE 1, LINE 2 and LINE 3, in addition to the integrated Bluetooth input.

Which Bluetooth formats does the amplifier support?

Bluetooth supports LDAC, aptX HD, aptX LL, aptX, AAC, MP3 and SBC. The wireless section uses Bluetooth 5.1, a Qualcomm QCC5125 chipset and an ESS ES9018K2M DAC.

Can the Cayin Jazz 70 be used with headphones?

Yes. The amplifier has a headphone output compatible with models having an impedance between 16 and 300 ohm.