Thank you for the reply and calculator.
@ 2.5 mV, the dB = 2.5 mV ->
Audio industory:
-49.8227 dBm
Television industory:
7.9588 dBm
Radio frequency engineering:
-39.0309 dBm
So, with 40 dB of gain in the phono pre amp, it is close to 0 coming into my Manely Shrimp pre amp. The pre has 11.8 dB so the 12 dB attenuator cancels that gain out?
Is that right?
Here are the specs on the pre:
ALL-TUBE: Vacuum Tube all-triode design
Input Tubes: 2 x 12AT7EH large plate Electro-Harmonix Russian
Output Tubes: 2 x 7044 or 5687 GE JAN NOS
Five Line Level Inputs: unbalanced RCA
MUTE switch and Warm-Up muting delay
NOBLE volume control: Accurate tracking usually within 0.5dB. Smooth operation. (no detents)
NOBLE balance control: Center detented
Record Output: (AKA "TAPE OUT") Unbalanced RCA jacks, unbuffered, passive (always ON)
Main Outputs: Two sets of unbalanced RCA main outs for bi-amping or driving a powered subwoofer
Gain: 11.8dB
Input Impedance: 250 Kohm
Input Sensitivity: 200mV in yields 1V out
Maximum Input Level: 5V in produces 1.5% THD at output
Frequency Response: 10 Hz - 80 KHz; 20 Hz - 20KHz, -0.3dB
Noise Floor: Typically -83 dB 20-20K with volume control fully open
Noise Floor: Typically -95 dB A WGT 20-20K with volume control fully open
Noise Floor (shorted input): Typically -94 dB 20-20K with volume control fully closed
Noise Floor (shorted input): Typically -106 dB A WGT 20-20K with volume control fully closed
S/N Ratio: typically 95 dB A WGT 20-20K
THD: 0.02% at 1V rms output
Output Impedance: 50 ohms
Maximum Output: +23dBu @ 1.5% THD into 100K load (10.9V rms)
Maximum Output: +20dBm @ 1.5% THD into 600 Ohm load