The EX888 is a tubes amplifier using KT88 power tubes and 12AX7/12AU7
for pre-amplification. We wanted to achieve with the EX-888 an amplifier
with an exceptional sound that honours the legend of tubes but also
benefiting from a reserve of power that allows easy association with the
majority of speakers in the market.
To achieve our goals, we used a proven pattern but with some unpublished parts (including a so-called anode follower), which allowed us to reconcile a low rate of reaction against (ensuring maximum power) and a very low level of distortion (less than 1% with a gradient odd harmonics characteristic of achievements tubes).
Optional board slot
Massive continuous power of 500VA transformer
It is based on a very high quality impregnated EI transformer capable of delivering a continuous power of 550VA. The diodes used in the rectifier bridge are broadband-like to ensure a continuous tension as pure as possible. Finally the filter is achieved by an innovative structure called CLC ie the equivalent of a third order filter for a perfect smoothing of the output voltage.
The winding of the output transformer uses a structure to achieve perfect symmetry output stages and the same minimal distortion. They use a deoxygenated copper wire. They are very generously sized to pass the entire dynamics of the output stage. They are wound in 3Ω and 6Ω (normed 4Ω and 8Ω) whereas the trend (long ago) prevailing in speaker manufacturers.
The volume knob is a motorized with APLS potentiometer.
Capacitors links are aluminum insulated polypropylene sheet.
They come from renowned manufacturer SOLEN.
The resistors areall high power.
Double side soldering.
The circuit is printed on epoxy and 70 microns thick.
|Specificatii||Alte caracteristici: Tubes: KT88×4 12AX7×2, 12AU7×2
Input Sensitivity: 360 mV (700 mV bypass)
Input impedance: 100kΩ
Dimensiuni: 430x200x405 mm
Greutate: 25 kg
Putere RMS: 2 x 40W (ultra-linear mode) or 2 x 20W (in triode mode)
Raport Semnal/zgomot: ≥ 93dB
Raspuns in frecventa: 10Hz ~ 38kHz (-1 dB)
THD: ≤ 1% (1kHz)
|Tip Echipament||Cu Tuburi|