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這一款SFX-03 Twin Tube Classic™雙channel的前級效果器在NAMM2006 上是被Seymour Duncan作為“準備大展身手的商品”來推廣的,半年的時間在各個吉他雜誌上獲得的評測,都是讚譽之詞。它的核心是一對迷你型號的6021真空管,美國製造的這對 Phillips Sylvania® 6021s是嚴格按照美國政府的MIL-E-1標準生產的,高品質的真空管帶來了真的rock and roll聲音。
眾所周知,真空管的品質是最直接影響的因素。通常,價格低廉的所謂“tube amp”中的廉價電子管總是以非常態的starved plate mode來工作的,但是這款SFX-03 Twin Tube Classic™雙通道電子管放大器中的高品質電子管保證了100%的真空管信號通路以及穩定的高壓支持。 這也就是“最寬廣的動態範圍,最大的增益,最圓滑的聲音”的代名詞。
它的功能才是最吸引人的。所謂的“雙通道”的意思是在一路單聲道輸入的情況下,這塊 Twin Tube Classic會產生三路獨立的聲音給一個單聲道輸入的音箱——Rhythm(節奏), Lead(主奏), 以及bypass,從結實的overdrive聲音到厚重圓滑的distortion,每一個通道都有獨立調節的寬廣範圍。電路系統的設計絕對去 除了通道切換時的噗噗聲。堅實的底座配上“雞冠頭”式的旋鈕,從外觀上就已經讓人產生了信賴。
為了讓電子管完美工作,SFX-03 Twin Tube Classic™使用的變壓器為16V交流變壓器已隨機配送。
SFX-03 – Twin Tube Classic
Specifications
Description – The SFX-03 is a two channel guitar preamp employing premium subminiature type 6021 vacuum tubes. The 6021 is manufactured to meet the stringent MIL-E-1 specification for reliability and is optimized to provide long service life under conditions of severe shock, vibration, high temperature and high altitude. The tubes are configured with a high voltage power supply for maximum dynamic range. True bypass capabilities are provided to allow uncolored feed-through.
External dimensions: 7.50 X 6.62 X 1.96 in. (190 X 168 X 50 mm)
Weight: 3.15 lbs. (1.43KG)
Gain:
Before level compensation
Rhythm channel – 74dB
Lead channel – 98dB
After level compensation
Rhythm channel – 52dB
Lead channel – 76dB
*Gain measured at 500Hz
Nominal output level:
Rhythm channel – 0.4 Vrms (-5dBu)
Lead channel – 0.5 Vrms (-4dBu)
*Nom. output level measured with 100mV 500Hz input signal and all controls set to 12 o’clock.
Max. output level before clipping: 2 Vrms (+8dBu)
*Max. output measured with all controls set fully up.
THD @ 1 Volt RMS output: 3%
Harmonic spectrum @ 1Vo: predominantly 2nd harmonic with minor amounts of 3rd harmonic @ > 20dB below.
Noise @ output:
Rhythm channel – < 1mV (< 3 dB hum content)
Lead channel – < 8mV (< 3 dB hum content)
*Noise measured with all controls set fully up and input shorted.
Power consumption: 10.4 W