意念 在 2004-8-31 22:30:18 发表的内容
fever兄:
没按你的规矩出牌,机器没到就出手了, AMPEREX 「吹喇叭」 12AU7 「应该不是長屏」?「D 環」更不敢奢望?,请估成色及价格,希望学费不要太高。忘了重要一点,4个参数不一致。
意念兄,圖中四枝 『吹喇叭』 的小胆兒的傾斜度不同,又有大細環之分,成色也算可以,參數不一致不要緊,只要相差不太遠﹙一定不可超過 10%,從左至右的第二和第四枝是大環,如參數相近當以此兩枝較好聱,如叫價不超過 500 元便可算物有所值了
谢谢fever兄,今夜可以入睡,请再指教。
大環对应D 環尔言?
60年代的产品?
测试中的grid emission 何意?
测试数据如下
4 Amperex Bugle Boy 12AU7 / ECC82 Vacuum Tubes. Made in Holland.
These tubes were checked with a B and K 707 Dynamic Mutual Conductance tube tester.
The tester recommends 65 or higher for this tube type and these tubes tested as follows:
Tube 1 81-87
tube 2 70-70 (grid emission)
tube 3 58-58
tube 4 45-42
This tester was serviced in October 2001 to make it more accurate. There is still some chance of measurement variance, as this tester is 30+ years old and has 42 different sockets on it. I believe to measurements to be reasonably accurate, but this is not a laboratory tube tester!