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-   -   The best tube pre from Vietnam - 818 Pre (http://www.diyaudio.com/forums/quanghao-audio-design/173764-best-tube-pre-vietnam-818-pre.html)

quanghao 17th September 2010 08:09 AM

The best tube pre from Vietnam - 818 Pre
 
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Hello!
Please introduce to you a Pre Amplifier designed by me and has been popular in Vietnam 5 years! And is considered one of the best in pre post in Vietnam. There was a lot of my friends use it, and so far they still love it!
I use a very simple design, using three types of tube are different: 6h30Pi, 6h6pi, 6dj8.
Sounds very realistic detail, balance!

This is a circuit diagram of the 818 pre! Pleas see it!
Thanks

quanghao 17th September 2010 08:31 AM

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And some all image

mach1 17th September 2010 08:31 AM

How many minutes do the tubes last running them at 40mA per section ?

quanghao 17th September 2010 08:32 AM

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and

quanghao 17th September 2010 08:34 AM

Quote:

Originally Posted by mach1 (Post 2305890)
How many minutes do the tubes last running them at 40mA per section ?

Tube 6h30 or 6h6 I use 1/2 tube = 20mA!
So one Chanel have 2 tube, per tube 40mA, Total = 80mA!
Thanks

quanghao 17th September 2010 08:44 AM

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The last time I meet Salas shunt, I use it with all cap MKP!
So I say i love Salas shunt and MKP cap for supply!
I have one image!

quanghao 17th September 2010 09:05 AM

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One friend live in the California USA, He make 818PRE, and he measure it!

quanghao 17th September 2010 09:11 AM

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And some image
And Salas shunt measure and my 818Pre

Wavebourn 17th September 2010 09:21 AM

Why is such a discrimination: you feed 6N6P with 80V more than 6N30P?

quanghao 17th September 2010 09:28 AM

Quote:

Originally Posted by Wavebourn (Post 2305928)
Why is such a discrimination: you feed 6N6P with 80V more than 6N30P?

No!
At anode :
6h30pi = 90V, Ia 1/2 tube 20ma. the sound excellent
6H6pi =170 ,Ia 1/2 tube 15- 20ma, the sound it the best, i see
and 6Dj8 = 90V, Ia =5-7ma, i like

Thanks


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