Amperex, Siemens, Philips, Tungsol, Rogers, Brimar, Bogen, Sylvania, Fleetwood, Westinghouse - ECC83/12AX7/5751/6681/7025/12AD7 from $400
The following tubes have been tested on a calibrated Hickok TV-7B/U where a value of 32 (ie. Gm 800) is the minimum Gm requirement. All these tubes tested around 38 ~ 54, ie. Gm 950 ~ 1350 in good to new condition, all tubes come with measurement results.

1. 5pcs. Philips 6681 new in box nib - $1600 each.
(made in Germany, rare communication grade ECC83/12AX7)
2. 2pcs. Philips Miniwatt ECC83 (made in Holland) Gm matched pair, nos - $1000
3. 2pcs. Philips 7025A (Mullard Blackburn factory) Gm matched pair, nos - $1000
4. 1pc. Philips SQ 5751 (made in Germany ) Gm matched, good - $500
5. 1pc. Sylvania 6681 (made in UK) Gm matched, new - $400
6. 1pc. Amperex Bugle Boy ECC83/12AX7, I61⊿9E, good - SOLD
7. 1pc. Amperex 12AX7/ECC83 (made in Gt. Britain) Gm matched, nos - $400
8. 1pc. Amperex 12AX7/ECC83 (made in Great Britain by Mullard Blackburn factory) new - $400
9. 2pcs. Westinghouse 12AX7A/7025 (made in England) nos pair - $600
10. 3pcs. Rogers ECC83/12AX7 (Holland) large getter ring, nos in box - $400 each.
11. 1pc. Rogers 12AX7/ECC83 (Holland) short ribbed plates, nos - $400
12. 1pc. Siemens ECC83 (made in Germany) goal posts getter ring, nos - $500
13. 1pc. Tung-sol 12AX7A (USA) selected painted-tip, long ribbed plates, nos - $700
14. 1pc. Bogen 12AX7A 45° getter ring (Great Britain) worn marking, nos -$500
15. 1pc. Brimar BVA ECC83 (made in England) Gm matched, nos - $400
16. 1pc. Fleetwood 12AX7 (Mullard Blackburn factory) Gm matched, nos - $400
17. 1pc. RTT 12AX7 (Mullard Blackburn factory) Gm matched, nos - $400
18. 1pc. unknown 12AD7 ultra low noise 12AX7 narrow rectangular getter ring, short smooth plates, good - $600

絕對正貨，請安心購買。
市區地鐵站交收，meet-up at MTR Stations.
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從加拿大带返之私人收藏。