SUNAUDIO VT-VT25LE 1.3W的输出令人赞嘆,它的诞生當然是有理由的。它的高音有如水晶般请澈通透,中音暖厚甜美,舆著名2A3胆不相伯仲但空氣感更好,低频方面雖然稍弱但亦是層次分明有控制力的表现。 它的優点最能在高效率喇叭如古ALTEC, GOODMANS, JENSEN等發揮得淋漓盡致。

基本線路和SV-2A3幾乎一様,不過VT-25胆耍用正流点灯絲否則交流噪音会令人難以接受,輸出牛换用SOT-850,它有5K  及8K的抽頭,在這裏選用較高的阻抗接往輸出胆的屏極。有－支回輸电阻(100Kohm)接通VT-25的屏極和柵極用以穩定本機的工作,因為VT-25對於震動及干擾是非常敏感的。

Sunaudio VT-VT25LE with 1.3W per channel amazed most customers, but its wonderful sound makes them realize that it is fabricated for a reason. The highs are crystal clear and extended, while the mids are warm and sweet, comparable to the famous 2A3 tube but with more details and air. The bass though not as full and extended as the other members of the family, is well defined and nicely controlled. Its beauty will be fully revealed with sensitive speakers due to its low output, and therefore vintage speakers such as Altec, Goodmas, Jensen are highly recommended.

The circuit construction is nearly identical to the famous SV-2A3 but the filament of the VT-25 tube need to be operated on DC in order to suppress the hum level to a reasonable low value. The output transformer OT-850 with primary taps at 5kohm and 8 kohm is employed here with the higher impendence tap connected to the plate of the output tube. A local feedback resistor is installed between the second output stage back to its input grid to ensure more stable operation since VT25 tubes are very sensitive to vibration and interference from other sources.

  VT-VT25LE in standard grey標準灰色

  VT-VT25LE in hot burning red火紅色機身

 VT-VT25LE線路圖

 

 

Specifications for SV-VT25Limited

Tubes	VT25 x2, 6SN7GT x2, 5U4G x1
Circuit Design	Single-Ended class “A” operation with negative feedback
Power Output	1.3W + 1.3W
Input Impedance	100k ohms
Input Sensitivity	200 mVs
Output Connections	8 ohms only
Frequency Response	20-20kHz/-3dB
Noise level	less than 1.0 mV
Power Supply	100, 120 and 220-240 VAC can be accepted at 50/60Hz (must select one) (*1)
AC Connector	Equipped built-in noise filter with detachable AC cord
Dimensions	W360xH190xD270 mm
Weight	16 kg

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