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[#21] RCA MI-12188A 这些古董机器还值得把玩吗    
Manual上的frequency response是20 to 20000 cycles!

忘記了在那裡聽過這機, 清爽有力, 推動力強, 但不失細緻, 好聽的機!

US$350, 平宜啊!

最後修改時間: 2019-05-16 20:38:14
wontun
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49.xxx.xxx.127
2019-05-16 20:24
[#22] RCA MI-12188A 这些古董机器还值得把玩吗    
antiqueradios.com 其中一個thread講"RCA MI 12182 amps". 有一個網友話 "According to the specs, the amp could be connected so it would be dead flat from 20 hz to 20 khz, or rolled off at either end. Rated distortion was less than 5% at 70 watts. It should sound pretty good. "

情況就好似我吔睇RCA MI 12188A manual話frequency response係 20-20kHz. 條response curve睇落好平直. 嗰specs好正.

另有一位網友回答 "I have three of these amplifiers, and they're beautiful pieces. A few years ago, I had a response curve run on one, and it was good, but a Macintosh, it ain't! I seem to recall that the high end was about 15,000 cycles and the low and about 50 cycles (3Db points. But they sound good, and just nice pieces to have. Theatre amplifiers were not really sensational anyway. Even following WWII, when these amps were made, sound on film was straining to get anywhere near to 10,000 cycles. Low end was satisfactory for theater sound, though. "

實際度出嚟得50-15KHz (3dB points). 我嘅理解係頭尾3dB roll-off.(有錯請指正) 以現今標準,3dB都好大吓. 呢個例子說明喺50年代Specs同實際量度可以出入好大吓. 我個人就吾太相信50年代可以做到咁平直嘅20-20KHz response curve. 對PA用途完全冇需要. 再看看現今啲output牛,要用到新物料(permalloy, amorphous, hi-B cores)先做到平直嘅response curve. 如果50年代已經係PA用途嘅牛做到就真係好驚人. 當然嗰thread係講MI 12182機但都好有參考價值.

https://www.antiqueradios.com/forum/viewtopic.php?t=36944
bambino
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123.xxx.xxx.146
2019-05-16 21:00
[#23] RCA MI-12188A 这些古董机器还值得把玩吗    
#22 - 講到5O年代的outputs, 大牌子的繞牛工藝今非昔比,例如UTC, Peerless, Partridge, Gardners等等,當時大批訂造,閒閒地都好靚,+/- 3db或更少間尺禁直。
hotiron
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49.xxx.xxx.199
2019-05-16 21:23
[#24] RCA MI-12188A 这些古董机器还值得把玩吗    
順帶一提樓主,除非你知道seller已經service部機又係fully functional. 否則都係check吓機先開聲.

Input AC 係105或120VAC
bambino
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123.xxx.xxx.146
2019-05-16 21:25
[#25] RCA MI-12188A 这些古董机器还值得把玩吗    
#19 - clipping power bandwidth我認為冇唛参考價值。
hotiron
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49.xxx.xxx.199
2019-05-16 21:28
[#26] RCA MI-12188A 这些古董机器还值得把玩吗    
#23 喺自己度response curve真係咁直,定睇嗰Specs?

剛剛睇過Hashimoto 5K PP OPT 嗰Specs, 10HZ roll-off 細過1dB. 非常平直! 不過實際使用就吾知.


最後修改時間: 2019-05-16 21:33:07
bambino
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123.xxx.xxx.146
2019-05-16 21:31
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