Well, not quite. The initial number at 1KHz was similar, I got 74dB, but I poked in deeper.
I tried different tubes in that position, and observed up to 10dB difference between some samples.
And there was also very strong frequency effect, with CMRR dropping by 26dB going from 1 KHz to 20 KHz.
Of course the circuits are most likely different to some degree, but the general effects might be similar.
I tried different tubes in that position, and observed up to 10dB difference between some samples.
And there was also very strong frequency effect, with CMRR dropping by 26dB going from 1 KHz to 20 KHz.
Of course the circuits are most likely different to some degree, but the general effects might be similar.
