The PH3 is a phono preamplification stage intended for use with an active line-level stereo preamplifier. Fully single-ended from input to output, the PH3 uses a combination of J-FET input stage technology (for low inherent circuit noise) and class A operation vacuum-tube gain via three 6922 twin triodes.

The PH3 is a phono preamplification stage intended for use with an active line-level stereo preamplifier. Fully single-ended from input to output, the PH3 uses a combination of J-FET input stage technology (for low inherent circuit noise) and class A operation vacuum-tube gain via three 6922 twin triodes.

Audio Research的PH3真空管唱頭放大，是ARC頗受好評的一部中價位唱頭放大，在1996論壇龍虎榜裡面獲得5顆星的評價。 電路上，第一級是JFET兩顆並聯，目的就是要降低雜音；後面才用6922再放大+緩衝，而且拉了負回授。

2008年6月10日 · The early PH3 was introduced by ARC as a budget piece, with the then-current SS PH2 selling for $1K more. I listened to both & bought the PH2. In turn the PH2 is substantially improved by replacing the stock MIT PPMFX coupling caps.

2011年1月21日 · I m planning to build a phono pre amp using the audio research PH3 schematic. However, I m having problem identifying what is the JFET Q1 and Q2 used in the first stage. It's called *6537* on the schematic.

Used with typical line preamplifiers having 12 to 18 dB of gain, the PH3 is suitable for phono cartridges having .25 mV output or higher. Input impedance is factory-set at 47K ohms, and input capacitance at 90 pF.

Originally retailing for $2600, this uses three 6922 tubes and a few transistors to bring the output of your favorite phono cartridge to line levels! Loaded with Sovtek 6922s per ARC recommendation, this phono pre sounds clean and detailed, featuring that Audio Research "High Definition Sound". Rated a decent Audiogon 7.

2022年5月9日 · The ARC PH3 phono preamplifier has very wide bandwidth, low distortion and low noise with 54dB of gain. It uses three 6922 (E88cc) tubes. Sonically it has a beautiful natural balance and a sense of space and depth.

From the ARC website: The PH3 is a phono preamplification stage intended for use with an active line-level stereo preamplifier. Fully single-ended from input to output, the PH3 uses a combination of J-FET input stage technology (for low inherent circuit noise) and class A operation vacuum-tube gain via three 6922 twin triodes.