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Kenetek 1176LN

UPDATE: After 11 long, grueling years, my fourth 1176LN clone is finally finished! This one is about as exact as it is possible to get, using original equipment power, input and output transformers, attenuator, FETs - even the case is an original UREi. I did make several, intentional deviations from the original. The zener diode in the +30V supply has a *much* larger heatsink on it, as this zener tends to deterioriate over time otherwise. I used a precision, 10-turn pot Clarostat pot for the meter zero, making it much easier to get the meter exactly on zero, and I used an 8-pin, socketed, DIP op-amp in the meter circuit, making replacement much easier if it's ever necessary. Here are some pics:

Kenetek 1176 Serial Number 4 Kenetek 1176 Serial Number 4 Kenetek 1176 Serial Number 4

The Kenetek 1176LN is one of my favorite units, probably because only four were ever made. #4 is the only unit residing in the United States.  The first two went to a buyer in Japan and the third went to a buyer in Norway.  

I took great care to choose and use components that give these units a bright, punchy sound. When compared with original units in a high-end Nashville studio, all engineers present chose the Kenetek units over the originals, noting that the originals sounded dull and lifeless by comparison. These 1176s are modeled after the 'Rev. F' 1176s and share the output stage and transformers found in other UREi designs of the early seventies. So, I was able to scavenge original power, input and output transformers, and output transistors from other, less valuable UREi units. I was also able to use original Teledyne U2244 FETs as the gain reduction elements. I think this is a crucial distinction, because these FETs have drastically different curves than the more commonly used 2N5457 and 2N5458 FETs, when compared on my semiconductor curve tracer.

Cloning the 1176LN is a popular project among pro audio DIY'ers. If you want to try your hand at building one, check out the following links at the bottom of this page.  One of the most popular hangouts for pro audio DIYers is the prodigy-pro forums. There, you'll find lots of info on how to build your own 1176, including pre-fabbed PC boards, schematics, assembly tips, sources for components and hot-rodding tips.

If you would rather buy a prebuilt unit, check out the Purple Audio MC77 and the Universal Audio 1176LN links below.

1176 Links
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I was also able to use original Teledyne U2244 FETs ???, from Jean-Christopghe NIQUET, posted 6/13/2008 12:00 PM