Pro-Jet tube box phono

tcflex · 發表於 2013-2-16 16:52:32

Can anyone know whether I can change the factory tube from 12ax7a to 12ax7? Any difference

lsiuman15 · 發表於 2013-2-21 12:54:41

simpson355 發表於 2013-2-19 13:47
12AX7a應該係曙光.... 同12AX7係同系, 不過a好似係差少少.
不妨試試JJ 既 12AX7 金腳. 中頻豐滿.
或可試EH ...

我嗰部PHONEBOX跟EH

tcflex · 發表於 2013-2-21 14:04:37

simpson355 發表於 2013-2-19 13:47
12AX7a應該係曙光.... 同12AX7係同系, 不過a好似係差少少.
不妨試試JJ 既 12AX7 金腳. 中頻豐滿.
或可試EH ...

That means 12AX7a is equal to 12AX7 in voltage except the sound character is different for different brand.

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[黑膠系統] Pro-Jet tube box phono