Mullard長屏方環 12AU7 Amperex 鋼片D環 RCA光頭仔12AU7A
測值全新或高測值 - fully tested on the Canadian Stark 9-66AU and Hickok TV-7B/U tube tester.
Transconductance (Gm) measured per section:
1. Mullard長屏方環 細盾ECC82/12AU7 - Gm 2050/2100
(‘k61 B8A’ I.1.8廠碼, ie. Jan 1958 Blackburn, England)
- HK$1300/single單隻
http://i98.photobucket.com/albums/l273/tubepower/20131024_101925cmmmx_zpsqpqlne9r.jpg
http://i98.photobucket.com/albums/l273/tubepower/20131024_102010cx_zpsrj31dzev.jpg
2. Mullard長屏方環ECC82/12AU7 - Gm 1450/1650 ＜ --- SOLD
(‘k61 B8A’ I.1.8廠碼, ie. Jan 1958 Blackburn, England) Gm雖然低但還有排用。
http://i98.photobucket.com/albums/l273/tubepower/20131024_102132cx_zpsqxhdmiui.jpg
3. Amperex(Rogers) 12AU7 foil鋼片D環 - Gm 2100/2000
( ‘k6A ⊿7I’ 廠碼，ie. Sep 1957 Philips, Heerlen)
- HK$750/single單隻
http://i98.photobucket.com/albums/l273/tubepower/20131024_101427x_zpsbhdmgtw6.jpg
http://i98.photobucket.com/albums/l273/tubepower/20131024_101805cx_zpsfiwzgyek.jpg
4. Mullard(Bogen) 12AX7A/ECC83 45° O環 - Gm 1050/1100
(Gt. Britain ‘1022-323’, 1022 is Mullard, 1963 week no. 23)
- HK$600/single單隻
http://i98.photobucket.com/albums/l273/tubepower/20131021_114414cx_zpsee5ej6rj.jpg
http://i98.photobucket.com/albums/l273/tubepower/20131021_114134cx_zpsen2ewvri.jpg
5. RCA光頭仔 12AU7A - Gm 2200/2200
(these are as new Tektronix selected units for their pulse generators)
- HK$200/single單隻, HK$450/ matched pair對裝
http://i98.photobucket.com/albums/l273/tubepower/20150731_143353_zpssb5x6zky.jpg
Minimum Gm requirement according to the Stark 9-66AU manual (Canadian Hickok tube tester, similar to Hickok 533A, Hickok 750):
12AX7 is 790/790 per section; new around 1150/1150
12AU7 is 1385/1385 per section; new around 2200/2200
絕對正貨, 請安心購買。
市區地鐵站交收，例如 金鐘站Admiralty MTR Station.
I am a vintage hi-fi and electronic enthusiast; all vacuum tubes are my private collection from Canada. 所有出讓的真空管都是小弟私人收藏，從加拿大带返。
Please leave pm with telephone number. Thank you!
有興趣的朋友請pm並留電話以便聯絡。
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作者：tubepower 於 2016-08-22 12:32:05 發表
測值全新或高測值 - fully tested on the Canadian Stark 9-66AU and Hickok TV-7B/U tube tester.
Transconductance (Gm) measured per section:
1. Mullard長屏方環 細盾ECC82/12AU7 - Gm 2050/2100
(‘k61 B8A’ I.1.8廠碼, ie. Jan 1958 Blackburn, England)
- HK$1300/single單隻
http://i98.photobucket.com/albums/l273/tubepower/20131024_101925cmmmx_zpsqpqlne9r.jpg
http://i98.photobucket.com/albums/l273/tubepower/20131024_102010cx_zpsrj31dzev.jpg
2. Mullard長屏方環ECC82/12AU7 - Gm 1450/1650 ＜ --- SOLD
(‘k61 B8A’ I.1.8廠碼, ie. Jan 1958 Blackburn, England) Gm雖然低但還有排用。
http://i98.photobucket.com/albums/l273/tubepower/20131024_102132cx_zpsqxhdmiui.jpg
3. Amperex(Rogers) 12AU7 foil鋼片D環 - Gm 2100/2000
( ‘k6A ⊿7I’ 廠碼，ie. Sep 1957 Philips, Heerlen)
- HK$750/single單隻
http://i98.photobucket.com/albums/l273/tubepower/20131024_101427x_zpsbhdmgtw6.jpg
http://i98.photobucket.com/albums/l273/tubepower/20131024_101805cx_zpsfiwzgyek.jpg
4. Mullard(Bogen) 12AX7A/ECC83 45° O環 - Gm 1050/1100
(Gt. Britain ‘1022-323’, 1022 is Mullard, 1963 week no. 23)
- HK$600/single單隻
http://i98.photobucket.com/albums/l273/tubepower/20131021_114414cx_zpsee5ej6rj.jpg
http://i98.photobucket.com/albums/l273/tubepower/20131021_114134cx_zpsen2ewvri.jpg
5. RCA光頭仔 12AU7A - Gm 2200/2200
(these are as new Tektronix selected units for their pulse generators)
- HK$200/single單隻, HK$450/ matched pair對裝
http://i98.photobucket.com/albums/l273/tubepower/20150731_143353_zpssb5x6zky.jpg
Minimum Gm requirement according to the Stark 9-66AU manual (Canadian Hickok tube tester, similar to Hickok 533A, Hickok 750):
12AX7 is 790/790 per section; new around 1150/1150
12AU7 is 1385/1385 per section; new around 2200/2200
絕對正貨, 請安心購買。
市區地鐵站交收，例如 金鐘站Admiralty MTR Station.
I am a vintage hi-fi and electronic enthusiast; all vacuum tubes are my private collection from Canada. 所有出讓的真空管都是小弟私人收藏，從加拿大带返。
Please leave pm with telephone number. Thank you!
有興趣的朋友請pm並留電話以便聯絡。
作者：tubepower 於 2016-08-22 12:32:05 發表