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Discussion in 'Amps and Cabs [BG]' started by lookjojoisplaid, Dec 27, 2005.
Yeha go for it explain
metal oxide semiconductor field effect transistor ... it's voltage regulated (like a tube) rather than current regulated (like a transistor).... I think this is supposed to make it easier to include in amp designs
MOSFET-A marketing ploy created by several amp companies, claiming that they sound "just like tubes, but with solid state reliability!"
Sorry, had to vent...
so what the big man upstair is lying to me and really sound maybe a little better than solid state?
Mosfet designs have sounded better to me than others, but not as nice as tube. but some new switching amps are starting to sound pretty nice.
Without being reactionary, MOSFETs are slightly closer to warm sounding than other solid state schemes. Not tubey, but smooth.
MOSFETs have similar overload behavior to JFETs or tubes in class-A circuits, i.e., preamps. But they are rarely used in preamps. When used at the output stages of mainstream power amps employing high open loop gain and linear feedback, one would expect no sonic difference between MOSFETs and bipolar power transistors.
What makes a tube power amp sound like a tube power amp is the much lower open loop gain, giving rise to higher distortion and "soft" clipping response.
Thus claiming that MOSFETs sound like tubes is indeed a marketing ploy.
Case in point, my DIY preamp design uses MOSFET op amps that are rigorously linear up to a hard clipping limit.
A MOSFET is a transistor, so it is solid state.
If the amp is accurate, whether it has MOSFET or bipolar transistors, it will sound warm if the input signal sounds warm.
Whatever "warm" means
There are many good, accurate, affordable, solid state amps on the market today.