Bakoon Products EQA-5640mk4 Phono Equalizer Amplifier

EQA-5640mk4 is a phoneequalizer amplifier that makes it possible to play vintage analog discs more correctly. Records up to the 1950s were mixed with various equalizer curves besides the current standard equalizer curve, the RIAA curve. Each record company had its own equalizer curve set by the recording age and record company. Currently, the National Record Association = RIAA unifies the equalizer curve. Most commercially available phoneequalizer amplifiers are RIAA only, so when listening to old records before the mid-1950s, you will be listening in a completely different setting. EQA-5640mk4 is an equalizer amplifier with six curves, currently standard RIAA and typical old equalizer curves NAB, COLUMBIA, FFRR, AES and OLD RCA. By using these six different equalizer curves, you can enjoy vintage discs from the latest records with the original sound.

When switching the equalizer curve, it is designed so that the fluctuation is within 0.3dB even if the 1KHz gain switches EQ, so it is convenient when switching the curve to check the sound change. By muting, noise can be suppressed by switching each selector, replacing the cartridge, cleaning the needle tip, etc. There is also no loop noise in the power amplifier connection.

Low noise, high resolution

By adopting HBK (I) -IC and HBFBC of the new generation SATRI (SATRI) circuit, the EQA-5640MK4 has a good S/N ratio, and it is possible to play without noise and distortion.

In addition to switching MM and MC cartridges, you can obtain the optimum position without clipping by setting the equalizer gain to 6 levels according to the output voltage of the cartridge. The MC cartridge with a minimal output voltage uses HIGH1, and the 10mV for large output MM cartridges with output voltage exceeding LOW2.




The output circuit also includes the conventional voltage output and current output SATRI-LINK. Therefore, the output impedance is a number 10M ohms, and the connection between the company preamplifier and the power amplifier is isolated, so it is possible to play high-dimensional analog records because it does not pick up induction noise even if the cable is extended.

The power supply uses an analog power supply with a high-quality toroidal transformer with a shield case, and the surface mounting parts are all made to produce a direct sound with no thickness in the middle range. Size is the same as SCA-7511mk4, compact amplifier size.

Input	Switch between 1, MM and MC cartridges
Output	Voltage output 1, SATRI-LINK output 1 (available simultaneously)
EQ Curve	RIAA, NAB, COLUMBIA, FFRR, AES, OLD RCA
Gain	HIGH1, HIGH2, MID1, MID2, LOW1, LOW2
Frequency Characteristics	20Hz~50kHz
Maximum output	8V (1% distortion)
Distortion (1KHZ)	4V: 0.06%
S/N ratio	-135dB(HIGH1)
EQ Error	±0.3dB
Dimensions	70mm(H) x 236mm(W) x 293mm(D)

*Bakoon ProductsThe logo and name will be changed to SCL (SATRI Circuit Laboratory). Thank you for your understanding.

Speaking of multi-curve phono equalizer, there is a CAP-1004 of the CAP series recently, but EQA-5640MK4 with multi-EQ curve correspondence, changes from the SATRI-IC in the age of MK3 the basic internal configuration to the newly developed circuit similar to the CAP1004, substantial Although it is a little disappointing because it seems to be graded down (although the sound of the comparison target Bacoon is a high dimension of surprise, so the worry of sound quality is not that much). If you are listening to vintage records from before the 1960s, listening to the original sound according to the equalizer curve of the record will have far more merit than listening to the sound of the curve's disconnected state. With the analog power supply of toroidal transformer, the voltage is stabilized and the impression that it is thicker or more rich than the CAP1004. It is possible to set the gain to six levels in detail, which corresponds to recent high power cartridges. In the MK3, it is natural that the relay of MUTE which was broken and unpopular was firmly countermeasured. 。
The function of the important multi-curve is that in the old days, the colocolo and equalizer curves are different depending on the record company and the recorded era, and there are things that the recording format is not described, so it is not a straight line depending on the record, but when it matches, the sound changes surprisingly tears, and the joy is also one. Also, DECCA used FFRR even in the 1960s, even though it should have been unified in RIAA from 1953 to 54, and the equalizer curve used before even after the adoption of RIAA by other RECCA companies was the sound growth at all It's interesting. This will be the best item that will lead you to a new search for an old analog board.