So far no matter what is done there are no sibilant problems on the RS61.
The output of the RS61 with the Fairchild power supply (see relevant post) can't exceed +20dBm.
The output of the 1566A cannot exceed +10dbm. It's output connected to a resistor of 560Ω and them a VTVM.
It may be that the Altec is more hotly driven?
Signal path, setup:
Beyer M 55 (K) - 500Ω to 50ΚΩ 300mH inline transformer - Pleiades V0 prepreamp - EMI or Altec preamp - 20dB resistive pad, 600Ω to 600Ω - Sennheiser HD580
With soft singing at 1in from the mic the Altec volume control has to be at less than 7 out of 10 for no s problems.
The EMI is all the time at its max gain setting.
How did they do that? The sound is full of high frequency detail. And no matter how you sing there is no s problem at all.
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