Jean Hiraga Bipolar MC preamp - diyAudio
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Old 25th January 2012, 06:08 AM   #1
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Join Date: Jan 2006
Location: Victoria, Australia
Default Jean Hiraga Bipolar MC preamp

After building a number of Le Pacific jFet MC preamps I found a schematic for a bipolar version from Jean Hiraga.The low noise transistors he used are no longer available but the SSM2220 chip is. It houses two matched NPN transistors in a 8 pin form. Of course they are super low noise.

Jean likes a ton of storage caps and big batteries to run his creations. Here I used 4 X 1F (1000,000uf) caps in series to give 1F of storage across the +/- 6V rails. Construction is on veroboard and the enclosure is Hammond. Output caps are Russian PIO (0.47uf). A 25 turn trim pot makes it real easy to dial 0V at the input. On a short listen the sound is natural and flowing and appears to work well with my Audio-technica AT-FM3/MKIII.
Attached Images
File Type: jpg MCII.jpg (213.1 KB, 229 views)
File Type: jpg MCFinishedI.jpg (127.0 KB, 216 views)
File Type: jpg MCFinishedII.jpg (142.6 KB, 199 views)
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