Originally Posted by justanoldmuso
gordon.

merry x to you.

no confirmation bias here. i have a good relationship with my local gear store....i can send back stuff i dont like.

from my digging apparently the triton doesnt use the run of the mill jfets.
i saw i think on you tube someone tested for noise at minus 130 db.
considering lots of mics are minus 55 db so i dont worry.

om
One has to be very wary of dB. For anything meaningful like this it needs a reference. Just dB alone is only a ratio and unless one knows to what, it's. The figure for the microphones is related to a sound level (94dB SPL), whilst the preamp is typically to 1mW in 600R (1.228Vrms). Picking a good dynamic mic at random (AKG D5) I see 2.5mV/Pascal, or 54 dB below that 1mW into 600R. The actual noise from a dynamic mic is substantially due just to the thermal noise of the resistance of the coil (not the impedance).

Unfortunately, comparing the -130dBu with -55dB/Pa is a bit like comparing apples with boomerangs.

Out of curiosity I had a (quick) look at some low noise transistors and found that at least some JFETs do now claim similar noise voltage performance to BJTs, so maybe my scepticism about JFETs may be out of date, though the comparisons are also not simple. Either way, both BJTs and JFETs are not so far removed from the room-temperature thermal noise of a low-value resistor, so close to the limits of physics.

Hmmm ... I guess that will go straight over the head of more than a few. Ho Hum.

Jazz relative beginner, starting at a much older age than was helpful.
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