audio:reused_low_cost_power_amps
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| audio:reused_low_cost_power_amps [2020/12/07 22:08] – mithat | audio:reused_low_cost_power_amps [2020/12/07 23:41] (current) – [Onkyo] mithat | ||
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| ===== Adcom ===== | ===== Adcom ===== | ||
| - | The Nelson Pass designed GFA-555 is known for a good but bright presentation. I will ... wait for it ... pass on that. :-D Other less costly GFA amps are widely available on the used market. | + | The Nelson Pass designed GFA-555 is known for a good but bright presentation. I will ... wait for it ... pass on that. :-D Other less costly GFA amps are widely available on the used market. |
| ===== Harman/ | ===== Harman/ | ||
| Line 18: | Line 18: | ||
| * Can't find decent reviews | * Can't find decent reviews | ||
| - | === PA 2100 ★ === | + | === PA 2100 ☆ === |
| * [[https:// | * [[https:// | ||
| * One for sale ad claims 1996-97, which is believable. | * One for sale ad claims 1996-97, which is believable. | ||
| Line 53: | Line 53: | ||
| ===== NAD ===== | ===== NAD ===== | ||
| - | NAD is persistently dogged by reports of reliability issues. Personal experience with a 7020 receiver (ancient!) corroborates | + | NAD is persistently dogged by reports of reliability issues. Personal experience with a 7020 receiver (ancient!) corroborates this somewhat. It also corroborates |
| === 2140 === | === 2140 === | ||
| Line 68: | Line 68: | ||
| * 1985 | * 1985 | ||
| - | === 2200 === | + | === 2200 ☆ === |
| - | * 1985 | + | * 1985-1989 |
| + | * 100 watts per channel into 8Ω | ||
| + | * Total harmonic distortion: 0.04% | ||
| + | * Slew rate: 25 V/uS | ||
| + | * Apart from input stage, symmetric circuit. | ||
| + | * Uses NJM 2043DD opamp in front end for bridging and soft clip. | ||
| * Very favorably reviewed in [[https:// | * Very favorably reviewed in [[https:// | ||
| + | |||
| + | === 2200PE === | ||
| === 2240PE === | === 2240PE === | ||
| ===== Nakamichi ===== | ===== Nakamichi ===== | ||
| - | These are claimed not to have output protection | + | These are claimed not to have output protection. Otherwise |
| === 420 === | === 420 === | ||
| - | After the front end, mirrored | + | * 50 watts per channel into 8Ω (stereo) |
| + | * Total harmonic distortion: 0.02% | ||
| + | * After the front end, symmetric | ||
| === 620 === | === 620 === | ||
| - | Fully mirrored | + | * 100 watts per channel into 8Ω (stereo) |
| + | * Total harmonic distortion: 0.005% | ||
| + | * Fully symmetric (" | ||
| ===== Onkyo ===== | ===== Onkyo ===== | ||
| Not as popular or having the same buzz as lots of other manufacturers. But the brand intrigues me. They pay at least lip service to wide bandwidth some some/ | Not as popular or having the same buzz as lots of other manufacturers. But the brand intrigues me. They pay at least lip service to wide bandwidth some some/ | ||
| === M-282 === | === M-282 === | ||
| + | * 100 Watt - 8 Ohm - 20 - 20000 Hz - THD 0.08% - 2 channels (main) | ||
| + | * [[https:// | ||
| === M-501 === | === M-501 === | ||
| + | * 150 watts per channel into 8Ω | ||
| + | * THD: 0.09% | ||
| === M-5000 === | === M-5000 === | ||
| + | * 105 watts per channel into 8Ω | ||
| + | * THD: 0.09% | ||
| === M-5010 === | === M-5010 === | ||
| + | * 75 W/Ch (1 kHz, 0.08%, 2 Channels Driven, FTC) | ||
| === M-5100 === | === M-5100 === | ||
| Line 102: | Line 120: | ||
| === M-5200 === | === M-5200 === | ||
| - | |||
| Line 110: | Line 127: | ||
| John Curl's involvement with the company lends them some cred. Whether the products not design by JC are to the same standard is not currently known. | John Curl's involvement with the company lends them some cred. Whether the products not design by JC are to the same standard is not currently known. | ||
| - | === Parasound | + | === HCA-500 === |
| + | * [[https:// | ||
| + | * 50 watts RMS x 2, 20Hz-20kHz, 8 Ω | ||
| + | * THD: < 0.25% at full power, < 0.15% typical levels | ||
| + | * Slew rate: 40V/ | ||
| + | * TIM: Unmeasurable | ||
| + | |||
| + | === HCA-800II ☆ === | ||
| + | * [[https:// | ||
| + | * 100 watts RMS x 2, 20Hz-20kHz, 8Ω | ||
| + | * THD: < 0.08% at full power, < 0.03% typical levels | ||
| + | * Slew rate: 60V/μ second | ||
| + | * TIM: Unmeasurable | ||
| + | * L/R volume controls on front panel | ||
| - | === Parasound HCA-800II | + | === Model 275 === |
| + | * [[https:// | ||
| + | * 75 watts rms per channel into 8Ω, both channels driven | ||
| + | * THD: 0.035% at full rated output, 0.025% at average listening levels | ||
| + | * TIM: Unmeasurable | ||
| === Parasound PA260 === | === Parasound PA260 === | ||
| + | * Claimed to use chip amps (SK...). | ||
| - | === Parasound Model 275 === | ||
| ===== Helpful resources ===== | ===== Helpful resources ===== | ||
| * [[https:// | * [[https:// | ||
audio/reused_low_cost_power_amps.1607378893.txt.gz · Last modified: 2020/12/07 22:08 by mithat