1960’s 西德Siemens E188CC/7308 E88CC/6922 ECC88/6DJ8

測值全新或高測值 - fully tested on the Hickok TV-7B/U tube tester. 以下出讓的膽己經headphone實際測試，合乎超低雜音要求。

Transconductance (Gm) measured per section:
1. Siemens E88CC/6922 金腳 silver shield HK$2200/pair對
- Gm 7500/8000 (stamped ‘A3 7I’ 廠碼, ie. 1967)
- Gm 6750/6500 (RCA, stamped ‘A4 9G’ 廠碼, ie. 1969)

The minimum Gm requirements are as follows:
- E188CC - 4095/4095 per section; new around 6500/6500
- E88CC - 3780/3780 per section; new around 6000/6000
- ECC88/6DJ8 - 4220/4220 per section; new around 6700/6700

絕對正貨, 請安心購買。市區地鐵站交收
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，從加拿大帶返。

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