wiring diagram for neohyb
silb wiring by , on Flickr
from the silbatone blurb
At Silbatone Labs, we engage in a lot of experimentation and exploration to discover new things that work. Our patented NeoHyb current multiplier circuit is one of our best innovations yet. Although we use mosfets in this topology for their awesome current delivery capabilies, this is completely unlike previous “hybrid” attempts, which usually involved a tube driver slapped onto a transistor output stage, the worst of both worlds, and never a high performance solution. This is why we call it NeoHyb. It has nothing to do with 1980s style hybrid amplifiers. NeoHyb is a whole new direction.
Our NeoHyb circuit uses parallel mosfets to enhance the current delivery of vintage triodes, yielding greater power and allowing for more conservative tube operating points at the same time. The mosfet is completely locked to the plate of the tube and adds no measurable influence, except greater current swing. The musical performance and distortion spectra are pure triode.
All signal current passes through a Silbatone foil output transformer. It acts and sounds like a pure tube stage, only boosted in output power. One use for this technology is that we can adapt very low power tubes, some ancient antique tubes, even preamp tubes, to play loudspeakers so we can learn and understand what they can do, often with very impressive results.
We can take medium output tubes like our standby 300B and shake the walls with power. And we are able to dial down the dissipation in tubes for both great longevity and the often higher quality presentation they can provide when operating at more moderate levels.
One lesson in our NeoHyb project is that what makes these tubes so great has nothing to do with low power output, per se. The struggle with low power output of so many of the best sounding tubes does not have to be obstacle to enjoyment. NeoHyb will satisfy with a wide range of popular speaker types, not only 110dB+ theater horns! And even with the most sensitive horn speakers, the headroom and drive created by our current multiplier technology opens new doors for old favorites,45, 71A, 275A, 2A3,, and many other great tubes not given the respect and wide use they deserve.