Have a look at the meter (carrier level indicator) on this photo of an excellent condition pre-WW2 RME 69. http://www.nucleus.com/~jordana/rme69dials.jpg Calibration is 0-72 db in six db steps, with
Well .. seems like the picture shows 48 dB makes S-9, or 5 1/3 dB per S Unit..... which as I seem to remember back when learning this stuff, that 5 point something dB was accepted as the S Unit, even
Most manufacturers "tried" to use ~5dB as an S-unit, not six. Six dB was NEVER an industry standard, as a matter of fact there never was any industry standard by any sense of the true meaning of "st