aion HORIZON Manual - Page 5

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BUILD NOTES

JFET selection

The original DLS circuit uses 2N5457 JFETs. Here's the bad news: through-hole JFETs are getting very

scarce these days, and the 2N5457 is no exception.

The good news: with JFETs, there is nothing magical about a specific part number. There is wide variance

even within a specific part number, and another part number with similar characteristics will sound

exactly the same.

For the DLS circuit, you're looking for JFETs with a relatively low V

voltage) as that determines when it goes into clipping. The 2N5457 has an average V

Based on these parameters, any of the following JFETs should be comparable:

• 2SK30A-Y

• J113

• PN4393

• 2N5484

Not all of these have been tested, so this is purely based on reviewing the datasheets. There may be

several other types as well. But with JFETs, it's best to have a variety of options so you have a better

chance of finding something that works.

If you can't find JFETs with the right specifications, note that just about any general-purpose JFET will

sound good in this circuit. But, you'll find that something with a higher V

reducing the total amount of drive available to the circuit and changing the characteristics of the effect.

HORIZON AMP OVERDRIVE

(also called V

, for pinch-off

GS(off)

of around -1.6V.

will go into clipping later,