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Boozhound Laboratories JFET Phono Preamp

Assembly manual (rev.2)

The Boozhoundlabs Philosophy

The plan here is to offer kits that let the curious audiophile experience designs that they would otherwise have to build

from scratch. The parts used in this kit are for the most part considered obsolete and are probably no longer being

manufactured. I source this stuff from overseas via eBay.

I think simplicity is a huge part of why classic equipment sounds so good, and modern stuff can sound so bad. In the days

when capacitors and transformers were expensive, designers minimized the parts count in any design, and this approach

is audible even when designing with modern devices. And for those of us who not only want to build stuff, but to

understand how it works, simple designs are much more comprehensible, with no "black boxes" that we only

understand through the abstraction of a spec sheet.

Why not have fun building stuff instead of just pouring dollars into your system on the quest for ultimate-ness? Part of

the fun for me is the ability to try something new without having to shell out the big bucks.

The JFET Phono Preamp

This is just about the simplest circuit possible that will accomplish what we need - reverse-RIAA equalization with gain.

This is 2 JFET gain stages with a passive (no feedback) RIAA equalization network sandwiched between them.

For more info, and to see how other builders have done something similar, you can search for a circuit called "Le Pacific"

which is the same topology, but with a slightly different EQ section and parts values.

Pretty nifty, huh? Only 22 parts per channel including the power supply filter stuff. The JFET gain stages are straight from

any electronics textbook. The RIAA filter section made up of R5, R8, C1, C2, and C3 are calculated using standard

formulas. Nothing special here – except that almost nobody does it like this.

Gain is approximately 40dB (about 30dB per gain stage, minus about 20dB for the RIAA EQ).