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In Reply to: RE: To worry about which variety of 12AU7 is better, seems a bit pointless to me posted by Mechans on July 10, 2015 at 05:25:34
Because no 12AU7 made actually sounds good as a gain tube?Maybe?
And, likely you are you're own man, when it comes to audio. Good for you.
:-)
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Edits: 07/10/15Follow Ups:
I have a great deal of respect for our EE inspired and longstanding experienced inmates. My questions reflect.healthy and reasonable curiosity no offense intended.
now back to the discussion.
I don't know if the 12AU7 is a voltage amplifier in this little Bravo 2
headphone amp. They don't provide a schematic which I could send to you and evaluate. The structure is clear plexiglass but I don't know whether you can see into it. The power supply is a walwart.
I am still left to wonder why the 12AU7 is even in my Jadis Da-60, an expensive amp with big "iron". The DA-60 is an integrated amp, the pre amp section uses 3 X 12AU7s and 2 X 12AX7s. (all rolled to 5751s and 7316s.) A better example of this fundamental part can be found at garage1217.com "project Ember'. You would enjoy this one because of the variety of tubes you can use with it . Makes me think it's not doing anything of critical importance.
I guess that I will just take you and Eli's word for it. My favorite pre amp is a cheap 2 tube unit, using I bet another bad choice, 6SN7s. I know the 6G8F is a better choice I have already read about that here in the asylum. However my tube collection is full of these non linear tubes. Selling then and acquiring tubes to replace them is a daunting task.
Steve
I honestly don't know why firms like Jadis use 12AU7s, ever!Down here in Aussie we have an acronym BBB. Bullshit baffles brains.
A lot of what you can read here from audiophiles and in the 'high-end' press falls under that idea. Not all of it, mind.
Here's a thought to carry with you into life. 'It depends.'
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Edits: 07/15/15
Well after that discussion re: the relative qualities of a 12AU7 and a 12AT7 I decided to try some of my 12AT7s. And would you believe it the 12AT7s with the first trial sound great! I am not sure if the increased mu is making them sound so much better or not. I have tried a number of 12AT7s, Brimar 6060s, Siemens ECC801S, Telefunken ECC82, and Mullard CV4024. They all sound really good, I just hope I am not destroying my little amp, (which cost less than some of the tubes I have used in it.) The amp is as I said a 1 tube hybrid headphone amp designed for a 12AU7. The only complaint is that I don't have much useable play on the volume knob, an almost otherwise inconsequential movement turns it way up.
Having a longer experience with tube electronics at this juncture, I am much more hesitant to just put in any tube with a pinout that will work. This time however it seems to be the right roll.
I am so pleased with this sound that I am going to start a thread about the 12AT7.
Steve
You nailed it. It does and always will depend.
Steve
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