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[前級] Nagra PLL (choice of tubes)

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發表於 2011-4-30 08:57:45 | 顯示全部樓層 |閱讀模式
Now using Telefunken smooth plate 12ax7 x 2, and Telefunken 12at7 x1.  I want to increase mid-range strength for rock/pop and vocal musics. Any good choices of changing tubes at a budget of HK$3K? Please advise. Thanks
發表於 2011-4-30 09:14:20 | 顯示全部樓層
Telefunken 12ax7係我用過8對12ax7膽之中最差(個人感覺)
當然803s除外

你可以試下Brimar 50年代灰屏/黑屏(1 pair 2k令),一定比你而家用開既Telefunken好好多好多~
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發表於 2011-4-30 09:26:32 | 顯示全部樓層
nagra hing
比個網頁你參考一下
http://www.wowhififever.com/12AX7%20%20ECC83.htm
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 樓主| 發表於 2011-4-30 09:54:11 | 顯示全部樓層
Thanks JanHau hing's info.  I have not spent too much time on tubes so far.  I changed the stock tubes to TFK on day one.  So, now hope to change tubes to get a bit more warmth and richness in sound. Do other c-hings have other suggestions? Thanks
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發表於 2011-4-30 09:59:47 | 顯示全部樓層
Telefunken好重中音,高低都係比其他膽弱好多,同埋層次感都較差
可試Brimar,Mullard,Valvo
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 樓主| 發表於 2011-4-30 10:08:06 | 顯示全部樓層
一定比你而家用開既Telefunken好好多好多~
>>>>>>>>>>>>>>>>>>>
Should change earlier. Must change now la!

What should be used to clean the tube legs which look a bit rusty (even new NOS tubes)?

If use 2 hours per day x 300 days a year = 600 hours a year, how many years need to replace tubes? I have heard that a 10M tube can last for 10,000 hours but not sure about ordinary NOS.
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發表於 2011-4-30 10:20:49 | 顯示全部樓層
生產膽果時佢地會加coating係針腳上面,所以係會咁
我會用火酒去清潔,先插上去用

用幾耐我都唔係太清楚,因為我有時間唔中都會換下膽玩,不過用到幾年都唔係好大問題,至多有平野果時入多幾對做後備
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 樓主| 發表於 2011-4-30 10:24:41 | 顯示全部樓層
Thanks again JanHau hing!

What tubes are you using now? What suggestions for 12AT7 ? Should same brand be used as 12ax7 ?
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發表於 2011-4-30 10:32:42 | 顯示全部樓層
現用緊一對50年代Brimar灰屏 12ax7,同1隻50年代iMullard 大盾12at7
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 樓主| 發表於 2011-4-30 11:45:51 | 顯示全部樓層
I see!
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 樓主| 發表於 2011-5-1 17:14:35 | 顯示全部樓層
本帖最後由 nagramen 於 2011-5-1 17:16 編輯

Just borrowed from a good friend:
- 2 x Miniwatt ECC83 (made in holland)
- 1 x Telefunken 801s (12at7)

The PLL sounds no more tightness compared to the previous whole set of TFK smooth plate tubes.  Soundstage wider with better extension of both treble and bass.  Like having upgraded the whole preamp. Will try to get some Brimar or Mullard tubes.

Thanks to JanHau hing for the good tips!
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發表於 2011-5-1 17:22:25 | 顯示全部樓層
nagra hing
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 樓主| 發表於 2011-5-14 12:00:18 | 顯示全部樓層
Now using GEC A2900 (=12AT7) with 3-mica and square getter. Background is very quiet, maybe less microphonic. Comparing with TFK 801s, each has its own strengths.

Hope to try Brimar 1950's 12AX7 tubes as recommended by JanHau hing soon. Changing the tubes can take nagra PLL to a much higher level. Need to try to believe.
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發表於 2011-5-14 17:45:27 | 顯示全部樓層
For 12AX7, you should try
Amperex Bugleboy 1950's Long Plate D-getter
You won't regret.
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 樓主| 發表於 2011-5-15 10:27:23 | 顯示全部樓層
googlei hing, thanks for your advice.   Should I get those Amperex Bugleboy tubes made in Holland or England? I note that some of them were made in Blackburn in England, probably OEM of Mullard tubes.
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 樓主| 發表於 2011-5-16 23:21:51 | 顯示全部樓層
本帖最後由 nagramen 於 2011-5-16 23:23 編輯

Now using GEC A2900 (=12AT7) with 3-mica and square getter. After just 50 hours of burn-in, my PLL has become another machine, so awefully good it is equal to a substantial upgrade.  

For Nagra PLL owners, I truly recommend buying a A2900 to bring out the very best of PLL. This little investment is a must! The C-P ratio is beyond words. Just want to share my excitment.
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發表於 2011-5-19 16:17:05 | 顯示全部樓層
c-hings,

May I know where I can buy the "GEC A2900 (=12AT7) with 3-mica and square getter" tubes you mentioned? How much?

Many thanks.
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 樓主| 發表於 2011-5-19 21:15:57 | 顯示全部樓層
waterfish hing:
I borrowed Miniwatt 12ax7, TFK 801s and GEC A2900 from a good friend for testing in my PLL.  I decided to buy the A2900 at HK$1K from him. The sonic performance is so impressive. But he does not want to sell the Miniwatt and TFK.

I am still looking for Brimar, Amperex or Mullard 12ax7.  Also, I have heard that Valvo 6201 (=12AT7) is comparable to A2900 and I am trying to get one for testing too.
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發表於 2011-5-20 00:16:56 | 顯示全部樓層
本帖最後由 safin 於 2011-5-20 00:18 編輯

I would prefer TFK 801s first, as price is reasonable comparing the same grade 802s & even 803s.  

As for Miniwatt, D-getter is best choice.  Big round getter is follow. Due to D-getter is difficult to find & expensive.  Preferred Holland made (by Philips).  

Valvo 12ax7 45 slant getter is also good in vocal.  Price is at middle range (not cheap but px not so scary)

Mullard 12ax7 someone said long plate , square getter is the best.  Well, it depends on your taste. Since coloration is more than the above listed tubes (to me).

As if for TFK 12ax7 ribbed plate, suggest to use one in PL-L only.  Mix with tubes with more coloration or good in vocal.
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發表於 2011-5-20 14:21:07 | 顯示全部樓層
Dear c-hings,

Thanks for the information.

Does it mean that all 3 tubes in the PLL should be switched to GEC A2900?

Your further testing report on other tubes is most welcome.
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