Description
The SRM-500T, which follows the numerical sequence of the SRM-700 series, is the successor model to the vacuum tube driver unit SRM-006tS and is 11 years in the making.
STAX custom-made low-noise DUAL FET is used for the first stage, and high-voltage double triode 6FQ7 / 6CG7 is used for the output stage. While following the traditional circuit design which is perfect for STAX vacuum tube drivers, they have improved the efficiency of the power supply and further improved the sound quality.
In addition to the conventional power transformer for the high voltage circuit, the newly designed power transformer with the winding for the low voltage circuit is installed in SRM-500T. By adopting this low-voltage winding, the efficiency of the power supply has improved, and compared to conventional vacuum tube driver units such as the SRM-006tS, power saving and improved sound quality have been achieved.
In addition, a new chassis with increased rigidity compared to SRM-006tS has been adopted. The hybrid structure, which uses a lot of non-magnetic aluminium, further suppresses the effects of physical external noise such as vibrations. The inputs are RCA and XLR, the mutual exclusion inputs. The custom made concentric dual volume knob which is common to STAX products and RCA PARALLEL OUT functions are installed same as the conventional driver units. All electric components are strictly selected considering the environment. Also the sound quality and the performance is improved. The complete DC amplifier configuration that the signal circuit includes no coupling condensers is one of the biggest traditional features.
The clear and highly transparent sound, a feature of the vacuum tube circuit and the warm and wide sound texture are maintained and the thickness of the low-mid range is brushed up.
Therefore they recommend the SRM-500T in combination with the advanced lambda series earspeakers (SR-L300/SR-L500 MK2/SR-L700 MK2).
Product Specifications
Type
FET + vacuum tube output hybrid DC amplifier configuration / driver unit
Vacuum tube
6FQ7 / 6CG7
Frequency response
DC to 90kHz (when using one SR-L500 MK2)
Gain
60dB
Harmonic distortion rate
0.01% or less (at 1kHz / 100V r.m.s. output)
Input impedance
50kΩ (RCA), 50kΩ x 2 (XLR)
Maximum output voltage
300V RMS (1kHz)
Bias voltage
DC 580V
Operating ambient temperature / humidity
0 to 35 ° C / 90% or less (however, no condensation)
Input
RCA x 1 XLR x 1
Output
RCA out
Power consumption
38W
Dimensions
195W x 102H x 376Dmm (including protrusions such as knobs)
Weight
3.4kg
Country of origin
Japan