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Lester

我想問下如果想換6sn7 係吾係一對一對咁match 就得, 吾洗4四隻match 晒?

Lester

在ebay 找了很久,想問下點為之Match ?

for example:

2 Vintage Telefunken 12AX7 ECC83 Smooth Plates Stereo Tubes
Tested on a Hickok6000A:  Min = 1250/1250
1925/1900
1875/1850

1925/1900
1875/1850

係咩[意思, 二隻相差 50 算吾算match ?

tvkeung

在ebay 找了很久,想問下點為之Match ?

for example:



1925/1900
1875/1850

係咩[意思, 二隻相差 50 算 ...
Lester 發表於 2012-1-8 20:48

Tube 1 result: 1925/1900 --> The first test was 1925, and the second test was 1900.  I usually take the average --> 1913.
Tube 2 result: 1875/1850 --> The first test was 1875, and the second test was 1850, average --> 1863.

My rule of thumb is that if the average for the tubes are within 10%, I would consider that the tubes are matched.  This is only based on my poor understanding of tubes, you may find different methods from the others.

Lester

Tube 1 result: 1925/1900 --> The first test was 1925, and the second test was 1900.  I usually tak ...
tvkeung 發表於 2012-1-9 02:23

   thanks ching, one more question, 點睇隻旦仲有幾耐命呢?  (60%? 70%? )

tvkeung

thanks ching, one more question, 點睇隻旦仲有幾耐命呢?  (60%? 70%? )
Lester 發表於 2012-1-9 09:24

It depends on the tube tester.  Different testers have different readings to represent the condition of tubes.  For example, if a tester said minimum 60 is good, and the test result is 95, then I would feel that the tube should still have lots of time left.  Another example, if a tester said minimum 1200 is good, and the result is 1950, then I would also feel that the tube is good enough for me to buy.

Take a look at the following links for different testers:
http://www.ebay.com/itm/Vintage- ... hash=item4cfd615172
http://www.ebay.com/itm/1-VINTAG ... hash=item337031c480
http://www.ebay.com/itm/RCA-HEWL ... hash=item27c22445b8

Lester

It depends on the tube tester.  Different testers have different readings to represent the conditio ...
tvkeung 發表於 2012-1-9 10:44

    thanks alot ching, actually, I find this:

ALL OUR TUBES TESTED ON TWO TESTER:
·         L-3-3 – CALIBRATED - Uplate=250v; Ugr=-2v; Ufil=12,6vl.
                                                1st TUEB - 1mA/1mA; 2nd TUBE - 1mA/1,1mA;
      TV7/U - 1st TUBE - 50/50; 2nd TUBE - 50/52 (MINIMUM ACCEPTED VALUE - 32/32)

50 vs 32, have 18 left, sounds not good right ?


http://www.ebay.com.hk/itm/ECC83-PAIR-TELEFUNKEN-DOUBLE-TRIODES-SMOOTH-12AX7-/310368949360?pt=Vintage_Electronics_R2&hash=item48436e5470#ht_1185wt_905

tvkeung

回復 36# Lester

Not exactly...as I said, it depends on the tester, may be the maximum reading for the tester is 60.  If so, then the tube is 50/60, still have 80%...

Lester

回復  Lester

Not exactly...as I said, it depends on the tester, may be the maximum reading for the ...
tvkeung 發表於 2012-1-9 11:28

OMG...

lampard

我想問下如果想換6sn7 係吾係一對一對咁match 就得, 吾洗4四隻match 晒?
Lester 發表於 2012-1-8 18:06

呢個係一個好既topic !
Lester hing!你個部Super88應該同我部Super34一樣個6SN7膽係分兩對Match! 係1,4 ; 2,3 配。
小弟係新手一名，對於膽的功能及特性都好有興趣知，始終對日後玩落去好有幫助!
以小弟愚見，換膽就等同其它器材一樣，要夾本身自已聽歌口味及本身套機嘅取向!
因膽係一針見效的良藥，當一換落部機到，D聲會立即變得不一樣! 我在購買Super34時，由於都心大心細
諗過部super88, 蛋王個大佬換粒12AX7俾我聽, 更換後，可把原來靠後的人聲突出番!  
自已參考開呢個網站：
http://tubedepot.com/

申報利益，自已用緊Melody Super34
EL34 x 4支： 換成Gold Lion KT77
6SN7 x 4支 : 分別換成Kenrad VT231 Black Glass 2支及Kenrad VT231  2支
5U4G x 2支 : 換成National 5U4G吊燈絲
電源線：Zu Mother MKII

googleli

小弟有以下12AX7:
德律風根 - 個人覺得太淡聲
Mazda - 音場闊但口變大, 粗聲
Sovtek - 平均得滯好似聽石機咁
Mullard 50年代 - 貴, 在儷珊買差不多成五千蚊對, 聲靚但慢, 低頻好好
Amperex 長屏D環 - 應該是目前最貴最難找, 問過中環某店賣七千蚊對, 有幸在網上三千蚊樓下買到, 聲音甜美, 但略嫌低頻太有彈跳感, 中高頻會點搶, 要用後級和線材馴服.
Sylvania - 目前使用中 -  暖聲舒服, 雖不及Mullard / Amperex 高音華麗, 但是聽得很自然, 而且低頻厚實.

沒試過大陸膽所以不能給予意見.