One more 4P1L SE

Wavebourn · 17th February 2011, 01:50 AM

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!

Wavebourn · 17th February 2011, 04:24 AM

Here is the picture of the breadboard:

GUOJIBAO · 17th February 2011, 05:35 AM

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
请多关照！！！！！

planet10 · 17th February 2011, 05:50 AM

Quote:

Originally Posted by GUOJIBAO

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

GUOJIBAO · 06:17 AM

sorry

my english is limited

Miniwatt · 17th February 2011, 06:36 AM

Looks very nice!
But I don't see the paralelled triodes in the schematic? (Probably because it's still early over here..)

Zmeika · 17th February 2011, 10:13 AM

Congratulations to the scheme!
I would like to ask, how is the tension on the resistor R13 / 10 Ohm /
Thanks.

Wavebourn · 17th February 2011, 04:00 PM

Quote:

Originally Posted by Zmeika

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.

Quote:

Originally Posted by Miniwatt

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.

Wavebourn · 17th February 2011, 08:22 PM

Correction: 320 milivolt, not 230. That means 32 mA of idle current.

woodturner-fran · 17th February 2011, 10:56 PM

Interesting this.,.... I have a few of those valves here. Might be one to consider for a future project maybe.

Fran

17th February 2011, 06:04 AM	#5
GUOJIBAO diyAudio Member Join Date: Feb 2011	sorry my english is limited Last edited by GUOJIBAO; 17th February 2011 at 06:17 AM.

17th February 2011, 08:22 PM	#9
Wavebourn diyAudio Member Join Date: Sep 2006 Location: Pleasant Hill, CA	Correction: 320 milivolt, not 230. That means 32 mA of idle current. __________________ If I disappear suddenly, that means I finally created a time machine and pushed wrong button that brought me to Stalin's Russia. In any experiment any result is the result. Even if it is negative.

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17th February 2011, 05:35 AM	#3
GUOJIBAO diyAudio Member Join Date: Feb 2011	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，学习请多关照！！！！！

17th February 2011, 06:36 AM	#6
Miniwatt diyAudio Member Join Date: Nov 2004 Location: Den Haag	Looks very nice! But I don't see the paralelled triodes in the schematic? (Probably because it's still early over here..)

17th February 2011, 10:13 AM	#7
Zmeika diyAudio Member Join Date: Nov 2007	Congratulations to the scheme! I would like to ask, how is the tension on the resistor R13 / 10 Ohm / Thanks.

17th February 2011, 10:56 PM	#10
woodturner-fran diyAudio Member Join Date: Jan 2006 Location: Ireland	Interesting this.,.... I have a few of those valves here. Might be one to consider for a future project maybe. Fran