更正勃总一个明显的错误，RKV用的并非LF353运放，更不是双运放

davidxtb

交易区新帖推荐

引用:

原帖由 davidxtb 于 2011-6-6 23:23 发表 不要说摩改了，给你元器件你让勃起总自己去做，他都做不出来RP010B那种素质和味道的机器，更不要说摩机了，这种NP的话，和今年夏粮丰收的谣言一样鸡毛。

原帖由 勃总 于 2011-6-7 07:51 发表
有可能，但不一定，那意大利老板是人，不是神！看了你老弟用627来代353的贴就笑疯了，那LF353是双运放如何能被单运放OPA627所代替，居然还出声？要么这运放不在音频通道里！

麻烦勃起总自己去看，不要以为自己什么都知道。
我们圈内玩RKV的人换OPA627/637都很久了，洋鬼子那边早就有人玩过，结果勃起总以为我们是这帮人是拿单运放换双运放不可能出声。可惜我们用了这么久，一直听到声音。
不过勃起总还是搞错了，那个运放是图上的，而且是单运放。
特此更正，千万不要搞错运放种类。
今天早晨才知道原来勃起总也会搞这种鸡毛的事情，我也笑疯了。

提醒，千万不要用双运放去替换RKV的运放，不然有烧鸡的危险。

[ 本帖最后由 davidxtb 于 2011-6-10 19:58 编辑 ]

wl336

不会烧鸡的。。反正记得v+v-都一样的。。。连反向都不烧

davidxtb

千万不要相信勃起总的话，否则烧鸡了，勃起总可能不会去负那个责任。

davidxtb

原帖由 wl336 于 2011-6-8 10:36 发表
不会烧鸡的。。反正记得v+v-都一样的。。。连反向都不烧

烧二房可能不会，但运放装反了自激太过频繁，可能烧掉耳机。曾经换了一款OPA的运放，结果每分钟都要跳灯。
KK可能没有关系，但一些比较娇贵的耳机，比如DT931那种耳机曾经挂掉过一次。
RKV的那个电路中，为了保证输出效果，居然是没有输出电路保护的。说明书也提醒说，应该在电路保护的灯灭了后才能插上耳机。

徕卡

这啥机器？做工看上去也很烂。

小白

勃起总。。。:D

davidxtb

原帖由 徕卡 于 2011-6-8 10:40 发表
这啥机器？做工看上去也很烂。

是RKV

徕卡

那电容苏州生产的.......

guts

反弹了，围观。

徕卡

老外的？外壳象是很用心，里面工艺真不咋样。

davidxtb

不过换OPA627/637虽然有跳灯的问题，不过热机之后，只是偶尔会跳一次。
当然，也有烧友甚至连桥接的那个阻抗都没有加，直接插上OPA637运放的，我不知道自激的频率是多少。但那个提升确实是非常明显的，如果用AKG的耳机，本身就狠吃电流，PCL805只要不是老管子，烧掉耳机的风险也没有多大。但其他品牌的耳机，还是要小心。
关于更换运放的说明：
OPA637和627并不能直接用在RKV上，会有自激的问题，解决方法并不是很负责，就是在第2和6脚上斜焊一个 68pf 电阻上面。具体操作见下文。之前的那种运放算是非常便宜的了，正品的也就是几美金的样子，我国淘宝上也就是几块钱或者几十块钱。
至于安装上OPA637/627的之后，提升可以说是非常大的，比换胆管或者保险的提升更大，声音细幼，两端延展也更好，细节表现更丰富，背景更黑。一般来说，RKV是推KK的推荐二房之一，但原装的RKV驱动KK确实未必会让你听得很满意。这对运放则可以弥补这些不足，更高的要求，就只能去找功放了。
至于OPA637/627，不建议在国内买了，AU版本的已经是够用了,.BM和SM之类的高档货反而会有声音火气过大的问题。EBAY上美国的那些三十美金左右的可以考虑，香港的就不要考虑了。国内有汕头的元音据说不错，我有朋友在那边买过运放，反映说可以。
- All overused cliche's aside - this mod is as subtle as a punch in the gut. -

Those of you familar with the RKV will know that it's one of the reference amps for driving the K1000's.

However, in it's stock configuration, it can be a bit reserved and warm, but it delivers lots of current while doing so. Small wonder it pairs well with the K1000.

Well listen up kiddies - yank the cheap opamps it comes with for a pair of OPA637's and you'll think it's the second coming! You'll need to solder a non-polarized 68pf cap across pins 2 and 6 first. The stock opamps are already socketed, so it's otherwise a very easy swap.

In exchange, you'll get such a gain in dynamics and overall responsiveness you'll bust a gut laughing at what a difference a couple of cheap little chips can make. The entire frequency range takes on amazing clarity and the low end will smack you around with such authority you'll be looking to file a police report.

Kid you not - this configuration easily bests a Singlepower SDS I've listened to recently and any ss amp I've tried. Fwiw, the Singlepower had the best bass control of anything I'd heard up to then.

And if you like it loud - this mod gives the amp so much clarity and punch at high volumes you'll cry uncle long before it runs out of juice - and it will maintain the same incredible presentation the whole time. Simpy amazing.

Staging? Oh Yea. Before the mod, some pieces had a distant sound almost like you happen to be walking through the Quarter and have stopped briefly outside a bar with a live band playing inside. After the mod - the bouncer has grabbed you by the short and curlies and deposited you in the front row.

Softer passages have a wonderful delicacy to them, and changes in dynamics are rendered very well regardless of the overall program level. Truly a revelatory experience.

The mod gives so much clarity and detail to the upper end that certain percussive events like cymbals and brushes on a snare drum float up out of the layers exactly as they should.

And regarding the very low end - this thing clamps on the low end of a pair of cans like nobody's business. I'm currently using a pair of loaner 650's and while I think they are a very good can, they have a tendency to get flatulent down low with lesser amps. Not happening with this thing - nosireebob! Listening to anything from an upright bass to a synth dance groove, you will be blown away. Those of you who are bassheads - or even the ones who haven't come out of the closet about that yet, seriously need to give this setup a listen.

徕卡

喜欢声音、工艺都好好东西，包括国产，呵呵不说了，免得被人误会。

RickyLung

来顶熊总的

激光鼠

围观一下