ECC82/12AU7 Line Preamp - Page 13 - diyAudio
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Old 26th March 2012, 02:14 AM   #121
popilin is offline popilin  Argentina
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Hi Wavebourn
Good to see you here.
As you said in post # 83, what Bigun said in post # 84 and my "Tarzan-English" I'm a little confused, sorry. BTW, the paper is still good.
Oh, very funny what the frog, gave me a good laugh.
Best regards
Johann

Last edited by popilin; 26th March 2012 at 02:18 AM.
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Old 26th March 2012, 02:55 AM   #122
Bigun is online now Bigun  Canada
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Quote:
Originally Posted by popilin View Post
Hi Bigun
Good to see you here, I'm still laughing, very good quote!
The paper that you told me I had read time ago, is very good, I didn't know it was Wavebourn.
I appreciate your response, these are the contributions that make me feel among friends.
Best regards
Johann
Hi, thanks !

Actually, I way complimenting Wavebourn by saying he could have written it, but actually he didn't, it was another person who's name is at the top of the web page I linked.

I have some Russian 6N23Pi tubes, they are very similar to ECC88. I'm thinking of making a simple common cathode pre-amp - like you are doing - it's fun to experiment ! But I have this little heater transformer good enough for one tube only so for stereo I can't use the SRPP approach you are investigating since I have only one triode per channel.
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Old 26th March 2012, 02:59 AM   #123
popilin is offline popilin  Argentina
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Quote:
Originally Posted by Tony View Post
johann, just go out there and build yourself a triode preamp.....this is what you wanted to do, yes? there are lots of data in those databooks that you can use......
Hy Tony
Thanks for your feedback, I have a lot of handbooks.
Forgive me for what was said in post # 14, it was not my intention, just now learning to use the Quote button, the comment was not for you.
It really helped me your link.
Best regards
Johann
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Old 26th March 2012, 03:30 AM   #124
popilin is offline popilin  Argentina
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Hi Bigun
Ah, now I understand.

They say good things about Russian valves.
Do not miss the opportunity of a SRPP only by a transformer.
Winding transformers is like fishing, or relaxes you or makes you crazy.
Why not a single transformer, custom made for a pre-amp, is not very expensive, and have fewer headaches with fields.
You can also take courage and winding yourself.
I'm finishing a PT for a pre-amp, two PT and two OPT for 25W monoblocks, thought that with Mom sewing machine would be easy, but don't, I had to do turn after turn, interleaved with epoxy and nomex, more than 80 total windings, I went crazy, but only one is easier.
Was mi first time, and now I'm "Hashimoto"

Last edited by popilin; 26th March 2012 at 03:41 AM.
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Old 26th March 2012, 04:37 AM   #125
avp1 is offline avp1  United States
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Originally Posted by Wavebourn View Post
As I said, even with such nice monitors I still hear sound of monitors amplified by amps. I don't hear sounds as if they are alive. That's the problem between your theoretical conclusions and my practical experience.

I listened to these frogs in my two systems (with different speakers). In both cases midrange frequencies are too emphasized to be natural. But it was much better, when I passed it through DTS Neo:6 in Cinema mode (in my Onkyo processor). So even simple simulated surround improved perception.
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Old 26th March 2012, 06:12 AM   #126
AJT is offline AJT  Philippines
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Quote:
They say good things about Russian valves.
i have had very pleasant experience with the 6P3C, 6j9, 6H23, 6H1P's so far.....

i still have the 6H30, 6C33C tubes to try....

to me Russian tubes are good tubes....

even the Shuguang EL34 that i tried the other day are quite good, guess i am lucky so far....
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Old 26th March 2012, 02:12 PM   #127
popilin is offline popilin  Argentina
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Hy all
What do you think it?
Who can say that the ECC82/12AU7 is bad?
My next nickname will High Voltage
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Last edited by popilin; 26th March 2012 at 02:21 PM.
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Old 26th March 2012, 02:20 PM   #128
SY is offline SY  United States
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Quote:
Originally Posted by popilin View Post
Who can say that the ECC82/12AU7 is bad?
People who have actually measured them as opposed to simulation.
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Old 26th March 2012, 02:24 PM   #129
popilin is offline popilin  Argentina
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Hi SY
You've heard it already?
As soon?
I still could not.
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Old 26th March 2012, 02:34 PM   #130
SY is offline SY  United States
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I've measured the linearity (or lack of same) on many 12AU7 examples, usually with circuits similar to the one you showed (the HV in that example is gratuitous). It is not a very linear tube. Your rather extreme earlier circuit may help, but as I mentioned before, you can achieve better linearity with other tubes and simpler circuits.
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