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Old 17th February 2011, 01:50 AM   #1
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Default One more 4P1L SE

Hi!

I am listening now to stereo amp with... 2.5W per channel!

Sounds very clean. Stereo imaging is perfect. Even depth is heard well.

Output stage uses 4P1L DH tube, triode connected. Input stage uses triode connected 6J5P tube, loaded on gyrator for minimum tube distortions, green LED in cathode. It is coupled to 4P1L grid through cathode follower made on 6N16B with paralleled triodes, dynamically loaded on current source. It is not a "power drive", it is the way to minimize distortions caused by non-linear grid current, especially when interstage capacitor is used.

The whole thingy is powered from oversized PS with stabilized voltages for -56, +120, +240 and floating 6.3V.

Enjoy!
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Old 17th February 2011, 04:24 AM   #2
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Here is the picture of the breadboard:
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File Type: jpg Gubernator-VII-chassis-1.jpg (207.6 KB, 3920 views)
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Old 17th February 2011, 05:35 AM   #3
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大家好,我是来自中国的一位音响爱好者,无意中走进了该网站
虽然,我英语水平有限,但好在我用的谷歌浏览器可以帮我翻译
希望在这里跟大家交流,学习
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Old 17th February 2011, 05:50 AM   #4
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Quote:
Originally Posted by GUOJIBAO View Post
Hello everybody, I am from China, an audio enthusiast, accidentally walked into the site
Although my English is limited, but fortunately I use the Google Chrome help me translate
Want to share with you here, learning
Best regards! ! ! ! !
English please

dave
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Old 17th February 2011, 06:04 AM   #5
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sorry
my english is limited

Last edited by GUOJIBAO; 17th February 2011 at 06:17 AM.
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Old 17th February 2011, 06:36 AM   #6
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Looks very nice!
But I don't see the paralelled triodes in the schematic? (Probably because it's still early over here..)
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Old 17th February 2011, 10:13 AM   #7
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Congratulations to the scheme!
I would like to ask, how is the tension on the resistor R13 / 10 Ohm /
Thanks.
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Old 17th February 2011, 04:00 PM   #8
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Originally Posted by Zmeika View Post
Congratulations to the scheme!
I would like to ask, how is the tension on the resistor R13 / 10 Ohm /
Thanks.
They are shorted out. I remove 4P1L in one channel and unshort resistor in another channel to measure and set 230 milivolt on it.

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Originally Posted by Miniwatt View Post
Looks very nice!
But I don't see the paralelled triodes in the schematic? (Probably because it's still early over here..)
You can draw it, if you want.
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Old 17th February 2011, 08:22 PM   #9
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Correction: 320 milivolt, not 230. That means 32 mA of idle current.
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Old 17th February 2011, 10:56 PM   #10
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Interesting this.,.... I have a few of those valves here. Might be one to consider for a future project maybe.

Fran
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