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ECC82/12AU7 Line Preamp
ECC82/12AU7 Line Preamp
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Old 27th March 2012, 03:17 AM   #151
popilin is offline popilin  Argentina
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Quote:
Originally Posted by Wavebourn View Post
Bigun already suggested you to ckick there: Tube CAD Journal
While answering Bigun I went twice interrupted, so two replies, sorry.
I visit very often the Tube CAD Journal page, I also did simulations of Aikido.

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Originally Posted by Wavebourn View Post
By the way, I've seen very similar picture in real life, the same -80 dB of 2'nd order only, from my Pyramid amp that contained 5 tubes per channel (actually, 6 if to cound pentode-triode as 2 tubes). The picture was very similar on half power, 40W. However, on higher power higher harmonics were visible. I don't remember already which input tube I used there in that version of the amp, either 6F12P or ECF-200. I usually don't do such measurements, only if somebody is curious to see.
I mean, 6AU7 is not the best choise.
Wow! -80dB, even in my dreams, is that at 1W?
I don't know 6F12P neither ECF-200, I guess it's a low signal triode-pentode, but nothing else, I will investigate.
Is very difficult to obtain good valves here, also closed the import
Maybe 6AU7 is not the best choice, but I think that would have to prove.
Wim de Haan, among others, the praises, other people the hate.
Only by intellectual curiosity, can be see the schematic somewhere?
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Old 27th March 2012, 03:22 AM   #152
TonyTecson is offline TonyTecson  Philippines
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sorry for the OT, i use lye in water to treat aluminum chassis....gives it a dull sheen....

ashok, you have name of that that i can look at...i use a local thing called Stripsol that removes paints, not tried on magnet wires though.....it is a pasty substance, and applied by brush, highly corrosive and painfull to the skin just like lacquer thinners....
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Old 27th March 2012, 03:26 AM   #153
SY is offline SY  United States
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Can you get some of the color test strips people use for checking pH of their swimming pools?
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Old 27th March 2012, 03:34 AM   #154
ashok is online now ashok
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Hi SY, I have some pH strips that I use to check acid content in my wine must. That's around 3.2 to 4.6 range I think and a few wider than that. I also have 0.2N NaoH solution and phenolphtalein that I use to check acid content by titration.
I can get any other acid/alkali indicators if required.
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Old 27th March 2012, 03:35 AM   #155
TonyTecson is offline TonyTecson  Philippines
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me? am afraid no.....
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Old 27th March 2012, 03:39 AM   #156
SY is offline SY  United States
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Originally Posted by ashok View Post
Hi SY, I have some pH strips that I use to check acid content in my wine must. That's around 3.2 to 4.6 range I think and a few wider than that. I also have 0.2N NaoH solution and phenolphtalein that I use to check acid content by titration.
I can get any other acid/alkali indicators if required.
The phenolphthalein should indicate if it's basic. No need to titrate, if a drop of the nasty stuff in some water still makes the indicator bright red, it's probably lye-based. Other possibility is peroxide.
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Old 27th March 2012, 04:04 AM   #157
ashok is online now ashok
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Yes I'll try that. I'll pick up a bottle of the 'stuff' soon.
If peroxide can bleach skin pigments ( I'm brown ...will tell easily !) then this one may not be it as it didn't bleach my skin or leave any marks. Just felt like a burning sensation when it touched the skin until washed off with water.
I have some 10% H202 here but that's too dilute to bleach skin pigments!
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Old 27th March 2012, 04:30 AM   #158
Wavebourn is offline Wavebourn  United States
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Yes I'll try that. I'll pick up a bottle of the 'stuff' soon.
If peroxide can bleach skin pigments ( I'm brown ...will tell easily !) then this one may not be it as it didn't bleach my skin or leave any marks. Just felt like a burning sensation when it touched the skin until washed off with water.
I have some 10% H202 here but that's too dilute to bleach skin pigments!
I have an idea. Acetone must help, slowly adding more of acetone molecules in polymer making it softer, but it is looong way, you have to soak it for 1-2 days.
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Old 27th March 2012, 07:01 AM   #159
ashok is online now ashok
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I currently have Amyl Acetate, Xylene and I think some Benzene. I'll have to pick up a bottle of Acetone. Any other possible solvents ? Might as well pick them up when I go to the shop !
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Old 27th March 2012, 01:57 PM   #160
avp1 is offline avp1  United States
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I currently have Amyl Acetate, Xylene and I think some Benzene. I'll have to pick up a bottle of Acetone. Any other possible solvents ? Might as well pick them up when I go to the shop !
You can try Dichloroethane too, it is quite toxic though.
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