Uploaded September 2017 | Updated September 2026, 2 weeks ago
Old-school "doing-things-the-hard-way" method, but applicable to all vintage equipment with phono preamps. Note: this is not the read-the-decibel or oscilloscope method. Another video will follow showing these methods. The calculations were done with the calculator at sengpielaudio.com/calculator-gainloss.htm
Equipment used: AC Voltmeter with adequate frequency response, an old Leader audio generator, and an oscilloscope to monitor the waveform. The semi-log graph paper can be found on the internet. The RIAA equalization curve can also be found on the Internet. A 15mV peak-to-peak signal was fed into the phono preamp. The output was taken from the tape (record) output jack.
Old-school "doing-things-the-hard-way" method, but applicable to all vintage equipment with phono preamps. Note: this is not the read-the-decibel or oscilloscope method. Another video will follow showing these methods. The calculations were done with the calculator at sengpielaudio.com/calculator-gainloss.htm
Equipment used: AC Voltmeter with adequate frequency response, an old Leader audio generator, and an oscilloscope to monitor the waveform. The semi-log graph paper can be found on the internet. The RIAA equalization curve can also be found on the Internet. A 15mV peak-to-peak signal was fed into the phono preamp. The output was taken from the tape (record) output jack.
