Very possibly so.
It is not from the microphone.
Some moving coil microphones for examole have equivalent acoustic noise figures that are extremely low.
When moving coil or ribbon microphones are connected to the Pleiades V6 head amplifier they sound at least as big, sensitive or low noise as the best condenser microphones. And of course with no s problems while the high frequency end sounds very extended and very natural (moving coil microphones do not have HF diaphragm reasonance. For example using Electro-Voice RE15, Sennheiser MD211 N, Grampian DP4/L etc.
(Coupling capacitor is usually 22nF, Pleiades bias resistor 6MΩ, the Nuvistor 7586 electron tube can also be used)
By feeding the follwing preamplifier with a hot signal of high s/n its gain can be reduced and the amplifier hiss decreases.
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