98 In stock
IWISTAO HIFI Preamplifier Tone Adjustment Bass Tremble Middle OPA2604 LME49720 Whole Aluminum Casing Class A Power Standard VersionModel No: WHFTC-PA3008
This preamplifier has tone control functions and adopts class A power, sound extremely delicate, slender high-frequency, low frequency plump and elastic, if use top op amp IC like as OPA2604 or LME49720, it will achieve perfect sound. Specially, it used a R-type audio dedicated transformer. And it has direct access function; you can skip tone adjustment to achieve original sound completely.
When audio sourcing record, speaker unit, placing the device is not necessarily perfect, and if your preamplifier adopt pure straight, it may not be able to meet the demand. At this moment, add tone adjustment function is very important. If you no extra power supply equipment, passive preamp tone is preferred, which can enhance the effect of high and low frequency is obvious.
R-type audio dedicated transformer
(Note: the unit adopt OPA2604 & LME49720NA instead of 2 metal sealed LME49720 of the photo above for standard version)
We had tried some solutions for this tone preamplifier. Ultimately, satisfied solution is both positive and negative voltage used the class A power supply with shunt regulator, and tone control section of high, middle, low frequency adopt negative feedback circuit, which has a natural tone and sound as delicate, pure and clear, rich layering; high frequency slim, sleek, sweet sounds and other characteristics; Also the unit has very quiet background sound.
Used with high-end components and parts, like as Phi lips’ capacitor, Class A Power adopt HIFI transistors for BC139, BD140 plus TL431, Germany WIMA ERO capacitors, Sie mens and other high capacitors, high speed rectifier, copper pins resistance…, to ensure high quality product.
OPA2604 is responsible for the first stage gain amplification
LME49720NA responsible for tone control
1. POWER: Power switch (up-- on, down – Off)
2. VOLUME: Volume Control
3. BASS: bass adjustment
4. MID: Middle adjustment
5. TREBLE: Treble adjustment (treble knob is turned to the end of left is direct access function)
1. Whole aluminum casing
2. Standard version: OPA2604AP x1 and LME49720NA x1 each one
3. With direct access functions and three band tone adjustment (Tremble, middle, bass adjustment)
4. Dimensions (W * H * D): 200mm * 45mm * 191mm
5. Weight: 2KG
Power cord X 1
AD827 op amp need match with 10K potentiometers if you insect AD827. Other op amp match 100K potentiometers is OK.
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