*Electro Harmonix 12AX7EH，產自俄羅斯，仍在生產中，口碑非常好。
*使用不超過50小時，九成新，玻璃上黃色粉字標記清晰。
*Electro Harmonix 12AX7EH具有醇厚的音質和清徹的低音，係最佳仍在生產12AX7真空管之一。
*圖1至3為實物拍攝,圖4為國際售價.。
*將軍澳站交收。

睇完下文你就知唔少用過Electro Harmonix 12AX7EH嘅發燒友都話佢靚聲
1)From our review of this tube: "The EH-12AX7 tube has a nice balanced sound, a very low noise floor and excellent performance in terms of microphonics. The lack of microphonics may be due in part to the return of a shorter plate structure or better materials. I've had some samples that were tried in various amp stages. Pre-amps, tone stacks and phase inverters, a winner in every location...I have used the EH to successfully tame amps that defied all other attempts to kill microphonics and unwanted feedback. This tube is a winner, buy 'em and try 'em, they may be just the piece you've been looking for."
以上全文出自 https://www.thetubestore.com/product/635?page=2?filter=5star

2)Hi thought the Electro Harmonix were the Sovteks but then why do all the Sovteks I buy sound blah and the Electro Harmonix good?
I looked inside and the Sovteks I had looks different. The plates on the Electro Harmonix are thinner, they look similar. The the Sovtek plates are the same color but wider. They are NOT the same tube. The Sovteks I have say 7025/12AX7 and look beefier. The EH tubes sound good, better then the JJ and Chinese stuff. The Tungsols RIs have more gain and lows, the Mullards reissue are OK. I have not really tried them as much because I like the EH.
I have seen GT Russian tubes and they have the R1 and R2. I really never looked closely I popped them in and if they sound good I'm happy. So far the Electro Harmonix have been the least problematic.
https://el34world.com/Forum/index.php?topic=10220.0

12AX7 =
歐州編號 ECC83 E83CC ECC803 CV492 CV404 M8137 B399
美國編號 5751 6681 6L13 6057 7025 7729