6SN7 CCS - Page 3

Cassiel · 11th February 2006, 05:17 PM

Oh, thanks for the info Jeapel. I only changed the 100 ohm resistor for a 220ohms. Current is around 5mA.

Quote:

jogis use 10ma for 2 x 6sn7 5ma for each tube

Yep, and i didn't parallel them so it was too much current....that was the problem.

Cassiel · 11th February 2006, 07:16 PM

Ok credit where is due. Heiko's amp sounds GREAT.
This one stays.

Cassiel · 13th February 2006, 09:52 PM

Input: 6dj8 -10 mA

Driver: 6SN7 - 5mA

jeapel · 14th February 2006, 11:47 AM

hi

WOW ! great tube software where i download

but there is something ? to me more current 10ma

on input stage and 5ma driver stage ? reverse

condition is more normal like

input maybe 2 to 5 ma

driver maybe 5 to 10 ma

output maybe 50 to 80 ma

bye

Cassiel · 14th February 2006, 12:53 PM

Hi Jeapel, these operating points sound good. I paralelled the 6sn7's....not good....paralleled the 6as7's....not good. 6SN7 with 5mA driving the 6as7 doesn't sound good. However with an extra stage, 6dj8 at 10ma, the amp sounds good...at least better than my other humble amps. Great bass.
I am no EE. I design by ear...sometimes it's tricky...but i don't follow many rules. Having said this it is also true that i will try other tubes, other operating points and other driver stages. Such is this hobby...you are rarely satisfied.

jeapel · 14th February 2006, 11:09 PM

thanks for your email :-)

you r right follow your ears not math design

bye

14th February 2006, 12:53 PM	#25
Cassiel diyAudio Member Join Date: Sep 2004 Location: Madrid	Hi Jeapel, these operating points sound good. I paralelled the 6sn7's....not good....paralleled the 6as7's....not good. 6SN7 with 5mA driving the 6as7 doesn't sound good. However with an extra stage, 6dj8 at 10ma, the amp sounds good...at least better than my other humble amps. Great bass. I am no EE. I design by ear...sometimes it's tricky...but i don't follow many rules. Having said this it is also true that i will try other tubes, other operating points and other driver stages. Such is this hobby...you are rarely satisfied. __________________ When the flag drops the BS stops.

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11th February 2006, 07:16 PM	#22
Cassiel diyAudio Member Join Date: Sep 2004 Location: Madrid	Ok credit where is due. Heiko's amp sounds GREAT. This one stays.

14th February 2006, 11:47 AM	#24
jeapel diyAudio Member Join Date: Sep 2003 Location: quebec	hi WOW ! great tube software where i download but there is something ? to me more current 10ma on input stage and 5ma driver stage ? reverse condition is more normal like input maybe 2 to 5 ma driver maybe 5 to 10 ma output maybe 50 to 80 ma bye

14th February 2006, 11:09 PM	#26
jeapel diyAudio Member Join Date: Sep 2003 Location: quebec	thanks for your email :-) you r right follow your ears not math design bye

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