Siemens-Röhren/Philips/Mullard/Sylvania etc. 6BQ5 EL84

測值全新或高測值 - fully tested on the Canadian Stark 9-66AU and Hickok TV-7B/U tube tester:

1. 西德Siemens-Röhren EL84/6BQ5 - HK$500/pc單隻
Gm 5800/5800/5600 (同廠碼 ‘kM4 ≠6J’)
http://i98.photobucket.com/albums/l273/tubepower/20130708_172403c-siemens%20x3x_zps1shrcdnl.jpg

2. Philips(Rogers/RCA/Marconi) 6BQ5雙杆O環 - HK$1600/quad四隻
Gm 5900/5900/5800/5700 (r2L5, r2c, rH9, r3H4廠碼)
http://i98.photobucket.com/albums/l273/tubepower/20131228_161055c-philips%20misc%20x4x_zpsgafqptlb.jpg

3. Sylvania (West Germany) 6BQ5 大O環 - HK$900/pair對
Gm 5900/5700 (同廠碼 ‘RQ HL’)
http://i98.photobucket.com/albums/l273/tubepower/20140613_130300c-sylvaniax2germany_zpsfdb07285.jpg

4. Tested like new IEC Mullard 6BQ5雙杆O環 < --- SOLD
Gm 5800/5700 (同廠碼 1022-810 ‘kM1 B7B2’)

5. Tested new Japan 60’s Hitachi 6BQ5雙杆D環 - HK$700/pair對
Gm 6000/6000 (廠碼 8-12, 9-6)
http://i98.photobucket.com/albums/l273/tubepower/20140613_131721c-hitachix2japan_zps17716c27.jpg

6. Japan 60’s GE 6BQ5雙杆O環 Gm 5800/5600 (同廠碼 ‘RA’) < --- SOLD
7. 6BQ5雙杆O形除氣環 - HK$600/pair對
Gm 5700/5700 brand marking is gone; construction is the same as 6.
http://i98.photobucket.com/albums/l273/tubepower/20130709_111714c-ge%20japan%2022x_zpsvm0kopkb.jpg

8. GE (USA) 6BQ5大O環- HK$250/pc單隻
Gm 5800 (廠碼 ‘84-52 33173’ 84-37)
http://i98.photobucket.com/albums/l273/tubepower/20131228_144536c-ge%20x1x_zpsvrnqat7w.jpg

9. United Electron (West Germany) 6BQ5大O環- HK$280/pc單隻
Gm 5800 (廠碼 ‘H974’)
http://i98.photobucket.com/albums/l273/tubepower/20131228_144734c-united%20x1x_zpsjoalmkcw.jpg


All tubes transconductance (Gm) measured around 5600-6250 new tube Gm value.
The minimum Gm requirement is 3660; new tube around 5800 according to the Stark 9-66AU tube tester manual (Canadian Hickok, similar to Hickok 533A, Hickok 750).

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。

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