*附圖1,2,及3係來自實物拍,新淨少用,測試健康強壯,已配對(紅色粉字因用手接觸有部份脫落),1對 $800
*附圖4來自國際網站,二手售價 US$ 69.00 每支港幣$ 552
*附圖5來自國際網站,全新售價 US$161.49 每支港幣$1290
實物與附圖4及5百分百相同,請細心參考.
它們非常溫暖,可消除任何擴音機一D“刺耳”聲音的絕佳選擇。
全中出於此連結 https://www.tctubes.com/RCA-12AX7A-gray-plates-1.aspx
*廠 牌:RCA
*編 號:12ax7 (5751;12AX7WA;ECC83;7025;6681)
*屏 極:長黑屏.
*除氣環:O環 (參閱圖三)
*製造國:美國
*製造年:1964
Corners test (模擬真實操作條件下測試電壓峰值及板電流的變化)
管A
Triode #1 - Plate Current = 1.02mA \ Rp = 56163 \ Gm = 1657 \ Mu = 93.0 \ Corners = PASS
Triode #2 - Plate Current = 1.08mA \ Rp = 56835 \ Gm = 1596 \ Mu = 90.7 \ Corners = PASS
管B
Triode #1 - Plate Current = 1.50mA \ Rp = 45374 \ Gm = 1957 \ Mu = 88.8 \ Corners = PASS
Triode #2 - Plate Current = 1.13mA \ Rp = 54268 \ Gm = 1680 \ Mu = 91.2 \ Corners = PASS
測試結果:無短路或漏電,所得數據優異(接近全新管)
Gm Nominal = 1250 \ Minimum Good = 700