Rerurn to Romy the Cat's Site
In the Forum: Analog Playback
In the Thread: The last phonocorrector: “End of Life" Phonostage
Post Subject: ResolvedPosted by N-set on: 11/27/2012
fiogf49gjkf0d
Fucking soundcard...I knew I should rather buy myself a good bottle of wine if I cannot afford a real equipment, but I got seduced by
the "simplicity" of mesurements and price...well, I got what I paid for: ~16k input impedance of my Fuck-blaster X-fuck soundcard
was creating an artificial corner together with the 834's output coupling cap. This, put into the
feedback loop, resulted in the unremovable peak at 35Hz. I first found that by simulating the circuit, so, yes
computers are usefull sometimes. It was then a pleasure to use my Tek SG505 + HP400FL to calibrate
the phono. I got a nice quite flat curve within +/-0.25dB up to ~15kHz.
Then I have -0.8dB @20kHz and -3dB@45kHz, which corresponds to the action of the 50kHz time-constant implemented
in the Hagtech's iRIAA. Below is the simed FR of 834, driven by the 600R iRIAA source with the 50kHz corner:
Cheers,
n-set
Rerurn to Romy the Cat's Site