Please identify these tubes 12AU7
acmf74
Posts: 936
in Electronics
I have 3 of these but need one more for a preamp. They are all 12AU7 and need a fourth to complete the set. Does anyone recognize them? 
Comments
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No idea about the tubes but I think it might be Miller Time.
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Clear top RCA's. There are much better tubes than those.Gustard X26 Pro DAC
Belles 21A Pre modded with Mundorf Supreme caps
B&K M200 Sonata monoblocks refreshed and upgraded
Polk SDA 1C's modded / 1000Va Dreadnaught
Wireworld Silver Eclipse IC's and speaker cables
Harman Kardon T65C w/Grado Gold. (Don't laugh. It sounds great!)
There is about a 5% genetic difference between apes and men …but that difference is the difference between throwing your own poo when you are annoyed …and Einstein, Shakespeare and Miss January. by Dr. Sardonicus -
Yes, based on the limited photo's they appear to be RCA manufactured tubes known as "clear tops". They are called that because the getter material is flashed on one side of the tube and it uses a "side" mounted getter. Most all other 9 pin signal tubes have the getter material flashed at the top of the tube and the getter mounted to the top mica via a post or the top of a grid post.
To me the sound is slanted upward and is very bright and they lack body. They are a very common tube made in the late 60's through the late 70's and perhaps even early 80's. Inexpensive.
There are better balanced tubes out there, but many like these especially if your system is darker and or closed in.
Personally, I couldn't get them out of my rig fast enough. I only tried them one time awhile ago. Don't need to try them again. IMO, of course.
H9"Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul! -
"Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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Agree with all above
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Thanks everyone!
