Van Alstine Vision Q MM/MC Phono Preamp
Unlike other designs, we do not need a third amplification stage, just a much better choice, an outstanding current buffer to isolate the second passive EQ section from the real world. We tested and listened to almost all the modern linear ICs available, some even surface mount chip types. We finalized the design with the LT1028 ICs for the first and second stage. The third stage uses a LME49600 current buffer to isolate the EQ from the real world and provide nearly one-quarter ampere of current drive to interface with any real world load. This combination provides the low noise and grain free outstanding dynamic range we demand. We never considered dual ICs because of their higher cross talk and distortion issues. Because the integrated circuits we selected have very low DC offset or drift, all coupling capacitors have been eliminated from the signal path. The Vision Q Phono Preamplifier is direct coupled from input to output. Because the linear ICs are driven to unity gain at DC, you have no worries about which brand or type of coupling capacitors to use there are none. The two capacitors in the passive EQ sections are select polypropylene types. There is plenty of raw power supply built into the Vision Q board itself, along with carefully regulated analog power supplies and decoupling directly at each active device.
Ratings & Reviews
The Giant Killer
You can do no better at anywhere near the price .
Price aside, the fantastic dynamic range and excellent tone of the Vision Q is outstanding !