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Old 14th July 2014, 09:38 PM   #1
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Default Yaqin MS-12B preamp - how to get more gain?

I love my MS-12B preamp, but there's one thing about it that bugs me. The volume out of the preamp is notably less than that out of my SACD player, iPod, AVR preamp outputs, or virtually any modern device. Is there a way to modify it to get just a hint more gain out of it? To bring the output volume up to the standard line level?

Charles.
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Old 15th July 2014, 03:45 AM   #2
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Increasing the plate load resistor on the 12AU7 from 30k to 100k gets you closer to 1.5v out instead of the stock .7v out.
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Old 15th July 2014, 04:19 AM   #3
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Or maybe split the 30k plate load resistor into two 15k resistors and bootstrap the cathode follower.
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Last edited by famousmockingbird; 15th July 2014 at 04:22 AM.
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