2016年10月12日 · Some of these tubes, like the RCA's Special Red line, are ultra-high reliability, which means they have such features as thicker (more robust) heaters, more or better internal …

2017年3月4日 · The 1950’s RCA 5963 sounds more dynamic than the standard 12AU7 Blackplate, IMO. It’s also a low-noise tube. The RCA 5814A is also a great Blackplate. My …

2018年1月28日 · I have one RCA 5963 tube which I haven't tried yet. I've read they are a variation of the 12AU7 tube but intended for used on computers (my God, computers made out of …

2009年1月26日 · 写真の真空管はrca製の5963で1971年のデートコードがついています。 この時代まで実際に製造していたのかちょっと半信半疑ですが、エッチングされた型番もRCAスタ …

2009年10月10日 · The 5963 has exactly the same basic characteristics as a 12AU7. Same plate voltage/current requirements, same heater voltage/current. The odd man out is the 5814, …

This 1970s military spec RCA 5963 is an industrial 12AU7 type tube. It has long gray plates and a halo getter. The green or orange print on the glass has the RCA logo and reads "JAN 5693."

This is a perfectly balanced single RCA 5963 tube that was made in the USA. This tube has plates that test identical to each other. This tube was manufactured to rigorous specifications …

2012年4月24日 · I have three RCA 5963's in a low gain VTA driver board on my ST-70 and I totally agree with you. These RCA 5963's sound better than any 12AU7 or 12BH7 that I have …

2012年12月23日 · 出RCA 高等级5963，12AU7的高级型号，相当于ecc802s。 长黑宽屏方环，方环上有小铁片，50年代生产成色和配对都非常好。 RCA 5963声音甜美细腻，解析力好，没有 …

2017年1月11日 · I'm using an RCA USN CRC 5963 with black plates and a foil "D" getter of 1958 vintage in the centre voltage amplifier position in my ST-120 with excellent results. Also have …