松下Matsushita ECC83/12AX7 45°斜方环带鉄片T云母长屏12-Taobao Singapore,ECC83 12AX7 Matsushita Used tested NOS Matched Pair RARE inclined big O getter,Matsushita 12AX7 Well Matched (7.7%) Pair NOS ECC83 | Reverb Finland,Matsushita (Mullard Japan) NOS preamp tubes ECC83 / 12AX7 / | Reverb,RCA 12AX7 vs MATSUSHITA 12AX7 Vintage Tube Comparison You make the call - YouTube