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HiFi 懷舊三十年 (十)之歷史中的日本單元之二

27 七月

先鋒是在影音上不斷有創新的公司,第一款喇叭單元 A8 已經一鳴驚人。

先鋒創辦人是個虔誠的基督徒,先鋒起初的公司名叫福音電機。

戰後先鋒與NHK合作開發大口徑全音單元以乎合新一代廣播要求,便出現了圖中的PE-8。

頻應直上10K,好過同期的德國全音呢。

HiFi 懷舊三十年 (九)之歷史中的日本單元

15 七月

日本單元自主品牌在四十年代湧現,除了三菱,松下和先鋒外,還有一些奮進的企業,只能留在歷史之中。

資料出處 : MJ 2002 – 2004

久壽電氣研究所

品牌叫 " HART" — 是否從 Hartley 化名而來 ? Wild guess 而已。

HiFi 懷舊三十年 (八)之日本人玩hifi的態度之二

11 七月

近來較多在國內的BBS 活動,少了寫blog。

國內朋友民族心態較強,正常。

相對來說,可能係旺記自己唔正常,做慣邊緣人。

Anyway,我常常覺得,思想包袱是心魔,能放得低就跑得快,跳得遠。

日本人是 Copy Cat 定係 Inventor ?

我會說,萬丈高樓從地起,第二層高過第一層,就唔係 copy 。

自從接收了英美的電聲技術,日本就進入自行研發的過程,識行識走。

以下是松下和三菱等大公司對 cone break-up 研發的剪影。

咪當人流料。

德國全音篇之 葵花寶典 (十二) – 完結篇

28 三月

What a wonderful World

If you’re a Lowther fan please stay the course. It’s nice to live in a fan club to get lots of contacts and be exited of building the next horn this isn’t mean’t for you. Changing your speakers against one of those described here win produce a disaster supposed your system is a sophisticated one. Lowthers built in a horn show strengths as well as weaknesses, and you tuned the whole system to these. Throwing in a much more linear, direct radiating speaker will immediately bring up the lots of compensation you arranged. I don’t want to condemn Lowther, nor at all. Yet they’re today’s audio experience in wide range or, if you tolerate their lack of bass, full range speakers, and I simply hope naming the contrast might help you to find out the right one for you.Using o]d radio speakers is knocking at heavens door. Speed, transparency, accuracy, detail. low level information everything isn’t just better than ever, it’s overwhelming. Within this mags pages I’ve found already noted, “light-speed-fast speakers" J and I always wondered where those listeners got the idea. Lowther? VOT? Other horns? These indeed are slow compared to the best radio speakers. No matter how good your present system is, it will ask for steady improvements. You’ve already changed your amp and now are driving a 2A3 amp as presented by Joe Roberts (SP 15)? Well done, boy, but now it’s time to look for a faster and more detailed thing. Perhaps a 45 with a 417a or a 7788 in the first stage will do. I don’t know your system but this I know for sure: These speakers will bring up everything. Medjocre caps in the signals path, flimsy power supplies, muddy output transformers etc. – now you’ll hear them !

Saddling old radio speakers nothing is slow and easy. I started ten years ago and not a single component within my system stayed. First came a unique drive unit for my turntable which underwent several refinments meantime (see SP 10); a new step-up transformer followed; it took me five years to work out an amp whose lucid speed and bang-on-accuracy can match; the third preamp will be next. Just to give you an idea what might happen to you and your HjFi system. The ultimate speaker most naturally ends up with the ultimate search for components. It’s a journey, and I enjoyed every step I did, loved the fun and pleasure I never ever lived before, and the results in terms of music are stunning. It1s a wonderful world you’ll enter.


One last note. If by chance you find an old SE radio still working well be a nice guy, hand it over to a radio lover and/or collector and ask him for single speakers in return. Don’t crack them up! They give such an amazing sound and offer so much pleasure of listening, Great HiFi should sound like the best (tube of course) radio you ever heard" Vinny Gallo stated (SP 1). Precisely! I really love steam radio (that’s how we call it in
Germany) and even more after looking inside. Learned a lot enchanted by this sound, detailed and relaxed accurate but always on the musical side, and never boring. We’re out for dreams, aren’t we? Hope yours win fulfill. Mine did.

旺記十分欣賞德國博士的 minimalist approach。現在許多人不斷 go after vintage 德國喇叭,特別是 cinema type,越追越貴,例如 KL405,四、五年前不過六百美元一對。現在大概已經翻一翻。

想體驗德國全音的魅力,幾十美元找對 elliptical 的,在8 khz 以上加對 cone tweeter,已經很好。Cinema speaker 是 tune for 劇院的,中音怎樣 ? 去戲院睇過戲就知甚麽是 Cinema speaker。

That’s. Enjoy fullrange. Enjoy music.

德國全音篇之 葵花寶典 (十一)

27 三月

原來近兩個月沒有續 葵花寶典。OK,儘快把全文整理刊登吧!

Some more miles to go

Supposed you got your set of speakers nevertheless there are some steps to speaker heaven. Yougave them a run on an small flat baffle and they’re performing fine, ok. Yes, they will do in any kind of enclosure of about two cubic feet. Being a novice you can handle it that way and you’ll be pleased. Old wisdom however recommended a (nowadays) very unusual shape of cabinet setting proportions to 0.618 to 1 to 1.618. (These masses are common in old architecture too.) For two cubic feet this is about 9 inch deep., 15 inch wide and 24 inch high. Such a speaker has to be placed 12 to 15 inch above ground depending on your habits.Each material to build boxes will come up with a sonic fingerprint of it’s own. Today various kinds of MDF are preferred but I found them slowing down the speed of radio speakers. I also noticed a b1urring of transients. I prefer plywood, the thinner the better, the lighter the better. The back of the cabinet should be made removable, these speakers are rear mounted ones. I’m using a reflex cabinet with a circular port of 4 to 4.5 inch. diameter. At the end of a long road I tuned the port to 65 Hz following my ears. Multipleats make a stiff suspension causing a sharp resonance in closed boxes, and it seems to be not so bad to bring this down a little with a reflex port allowing the speaker to act more linear. For your calculation of the port use the old formulas based op the wisdom of Lard Rayleigh and Helmholtz . The Thiele/Small formulas are developed for today’s speakers and don’t fit here. Of course some damping is needed inside, and for me foam is fine. How much depends on the speakers you got, but with a removable backside it is possible to check this by try and error, consuming a little time only.The modern way is fixing the speaker to the box as stiff as possible but with old ones it’s just the opposite. Main drivers and super-tweeters come with a decoupling ring of felt (sometimes foam) and this is the only part of the speaker you can and should renew if necessary. Using plastic screws to fix the speaker is a good idea but don’t tighten them too much. Adjust the nuts with a little shot of glue to keep them down. Last not least: The papercones are sensitive to humidity, that’s why they’re covered with cloth in old radios. Always treat them as you would treat an excellent tube of that area .

除了 OB 外,旺記曾經 strictly follow Dr. Wilimzig 做了 2 cubic feet golden ratio 的箱。效果一般。後來做給 Coral Beta 10 的  “大雪櫃" 就是累積了做幾個箱的經驗。

旺記的分享是 : the bigger the better 。 像 Coral Beta 這些 low Qts 的單元,用大箱加 reflex port 或 passive radiator 效果就十分好。German full range 的 Q 太高,應用 aperiodic 。

木的使用,以前已經討論過,硬淨收水足的北歐夾板是上選。大廠使用 MDF的原因只有一個 –  cost control 。

德國全音篇之 葵花寶典 (十)

9 二月

去了幾天西安,對這個古城的感覺不錯。

行程很急,怱怱看過了兵馬俑。

没有甚麽驚喜,可能看的 documentary 太多了。

倒是星羅奇佈的紀念品店子,數以千計的自篤導遊,煞有介事的區内電動車(set up 個售票店又賣車票,原來行程就係约一百米咁大把,仲話包來回),區外幾間大型的兵馬俑仿製廠…完全符合國情。

看到那些仿兵馬俑,心中不禁問,放在坑裡的,是不是….

續 葵花寶典 (九)

“I love the 8 incher with matching super-tweeter. So you need that super-tweeter too, and evidently of the same good condition. And you want a second pair for stereo. I had to learn the hard way: Within those jolly good times a minor change in production, say getting another speaker to stuff it in, was never announced. You’ll see brand names (same year of production, same type number of radio) with different speakers, sometimes drivers were changed twice a year! And I can’t help you in finding out, you’re miles out in the cold and have to check yourself. Therefore it’s not so bad to hunt for those radios which once were spread out in tens of thousands. Thus you work your way through hamfests, garage sales. flea markets and the like, always carrying with you a collection of photos showing what you’ve already achieved, and of course you pinned down brand name, year of production and type number on each photo, didn’t you?

 

Old style radio speakers weren’t built in stereo pairs. To match them now measure two electrical quantities: DC resistance and inductance of the voice coil. A good match stays within 25%. Getting all this together the brand name doesn’t matter any longer – if you indeed got the speaker’s name, a sticker alone from the radio manufacturers name can mean nothing, as the speaker can be produced elsewhere, Talking of 8 inchers till now was neglecting reality a bit. Yes, it’s the size but not the shape, most of them aren’t circular, they’re oval, roughly 7 to 10 inches. It would be the audiophile way to start a fight on princjple – don’t do it. Go for those you get in good condition and good matching no matter if oval or circular. They’re fine anyway."

要執平嘢嗎?Elliptical的單元一點都不差過八吋的 counterpart,旺記甚至認為 elliptical的 tonal balance 更好。兩者市塲差價這樣大,完全是心理因素。

德國全音篇之 葵花寶典 (九)

25 一月

今天朋友問旺記工行值不值得買。

旺記說若非手上的 1398 是 IPO 認購回來的話大概一早已經賣掉了。

為甚麼?先說曾讓旺記輸大錢的 941。

中移動終於回到二千年的價位。

反過來說,中移動在二千年的價位,已反映了它七年後的價值。

那麼,現價的工商銀行,反映了它幾多年後的價值?

長揸?Value investment 的所謂長揸,是揸價值未被市價反映的股票。已反映的,揸住就是為了股息,投資意義等同債券,不過隨時可走人而已。

旺記不賣工行另一原因,是號碼正斗。1398,夠晒醒神。That is.

續  葵花寶典 (八)

Starting your search(1)

 

This is the question everybody wanted to be answered during my last years: What brand name should I look for? With questions like that you’re fooling yourself, definitely. There are things you should pay attention to instead because they are much more crucial.

 

First of all you need speakers of good condition. I never found NOS, the best you can get is near mint or very good. To check this look for the paper of the cone. Any damage?. Watch the multipleats using a bright light, preferable sunshine. Do they look regular? If the paper shows a brown to yellowish coloring the speaker was damaged by the heat of the tubes, you can’t use it any longer. This happens especial1y in smaller radios, and in bigger ones to the supertweeters which sometimes are placed above the power tubes causing burnout after some decades. Would be wise to go for not too small radios which come (in Germany !) mostly with 8 inchers. Yes, I’ve seen a Philco big box carrying a most interesting 10 or 12 incher inside, but this was an ultra rarity. And a 12 inch wide range unit running up to 12 kHz? Would be better to go for 8 inchers.

Furthermore you should move the cone a little and take care there is no scratching. These old timers had forty years of time to pick up metal dust or small pieces of glue, and it’s impossible to remove these because the air gap is too small. If you find lots of dust on the chassis frame the speakers were exposed to humidity, always troubling the paper cone.

 

 在最著魔的時候,旺記就是一部一部收音機從德國運過來,拆去單元,丢掉機肉。

 

極不環保,罪過 罪過。