Vintage. Dude
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Hi.
I want here to post some reviews of pioneer elite from Golden age of hifi. Lets go
Pioneer c90 review/measures from Stereo magazine 80s
Lab Tests
The clipping level of the C-90’s audio outputs (terminated in the El A standard load of 10,000 ohms in parallel with 1,000 picofarads capacitance) was 11 volts, comfortably exceeding the rated 8 volts.
Since the rated output was at least four times as high as any power amplifier will require in order to develop its rated output, the conservative design of the C-90 preamplifier was apparent from the beginning of our measurements.
The distortion specification of the C-90 is 0.002 percent, and at most usable output levels and frequencies, that was about what we measured. At 1,000 Hz, the distortion was 0.003 percent or less for outputs from 0.3 to 4.5 volts, rising to a mere 0.0063 percent at 10 volts. At 2 volts output (a more reasonable maximum value for any preamplifier), the distortion was 0.001 percent at 20 Hz, rising smoothly to 0.0016 percent at 1,000 Hz and 0.003 percent at 20,000 Hz.
The RIAA phono equalization was one of the most accurate we have ever measured (comparable to the tolerances of the pre-equalization network we use for this measurement). It was flat within +0.1, — 0.2 dB from 20 to 20,000 Hz. The frequency response of the preamplifier was comparably flat, and the response with its high filter engaged was 3 dB down at 11,500 Hz. The subsonic filter dropped the response by only 0.5 dB at 20 Hz (it is rated to have a 6-dB-per-octave slope below 7 Hz)
I think it is safe to say, however, that the C-90 at least ranks with the best in the field."
Source: https://www.hifi-classic.net/review/pioneer-c-90-161.html
I want here to post some reviews of pioneer elite from Golden age of hifi. Lets go
Pioneer c90 review/measures from Stereo magazine 80s
Lab Tests
The clipping level of the C-90’s audio outputs (terminated in the El A standard load of 10,000 ohms in parallel with 1,000 picofarads capacitance) was 11 volts, comfortably exceeding the rated 8 volts.
Since the rated output was at least four times as high as any power amplifier will require in order to develop its rated output, the conservative design of the C-90 preamplifier was apparent from the beginning of our measurements.
The distortion specification of the C-90 is 0.002 percent, and at most usable output levels and frequencies, that was about what we measured. At 1,000 Hz, the distortion was 0.003 percent or less for outputs from 0.3 to 4.5 volts, rising to a mere 0.0063 percent at 10 volts. At 2 volts output (a more reasonable maximum value for any preamplifier), the distortion was 0.001 percent at 20 Hz, rising smoothly to 0.0016 percent at 1,000 Hz and 0.003 percent at 20,000 Hz.
The RIAA phono equalization was one of the most accurate we have ever measured (comparable to the tolerances of the pre-equalization network we use for this measurement). It was flat within +0.1, — 0.2 dB from 20 to 20,000 Hz. The frequency response of the preamplifier was comparably flat, and the response with its high filter engaged was 3 dB down at 11,500 Hz. The subsonic filter dropped the response by only 0.5 dB at 20 Hz (it is rated to have a 6-dB-per-octave slope below 7 Hz)
I think it is safe to say, however, that the C-90 at least ranks with the best in the field."
Source: https://www.hifi-classic.net/review/pioneer-c-90-161.html
