Using Simple SE with a preamp

gasser-dude · 19th January 2010, 02:05 AM

Is there anything that should be changed in the stock circuit when running it with a preamp? Using either solid state or tube.

SGregory · 19th January 2010, 10:06 AM

Nope. Just watch if your preamp has alot of gain that you are not clipping the amp when trying to play it louder.
If it is permanent then you could eliminate the volume pot, not required though.

I like to use my preamp with the SSE using CFB. I get the gainback.

gasser-dude · 19th January 2010, 11:52 AM

Sounds good! I have no volume pot and always use it with a preamp. I have a tube pre that is uses a 6dj8 and a 6ns7 but it has to much gain about 1 click on the alps 50k pot and she is to loud. Need to do some looking into on that. Thanks

rknize · 19th January 2010, 03:21 PM

The SSE has a plenty of gain, so a pre is not needed to put the amp into clipping from typical "line level" sources. How much gain does your preamp have?

Skorpio · 20th January 2010, 11:57 AM

Can the current source at the input tube anode be replaced by a resistor if the gain is to high?

Will it affect performance (other than PSRR) compared to CCS?

rknize · 20th January 2010, 03:00 PM

That would reduce the gain. How much depends on what operating point you choose.

Davec113 · 20th January 2010, 03:21 PM

I have a high-gain tube preamp that I like, so I built the Simple SE without a volume pot and used a JJ ecc99 / 12bh7 driver tube. It has a lot less gain than the at7. I posted about it in a thread about driver tubes in this forum.

webby · 25th August 2011, 09:33 AM

Hi all,
I am a little confused about the lowering the gain on my simple se.
I am using a 26 DHT pre amp, and finding the gain too high on the SSE.
What input valves can i drop in place to lower the gain, and any components i need to change on the PCB?
Is the 12bh7 such a tube?
Thanks
Ian

rknize · 26th August 2011, 12:39 AM

12BH7 is a suitable substitute, but it requires a different set point on the CSS to operate it in its most linear region.

Russ

Skorpio · 26th August 2011, 06:56 AM

Quote:

Originally Posted by rknize

12BH7 is a suitable substitute, but it requires a different set point on the CSS to operate it in its most linear region.

Russ

I would like to try that i SimpleSE, could you give a qualified starting point for 12BH7: CCS current and Rk value?

19th January 2010, 02:05 AM	#1
gasser-dude diyAudio Member Join Date: Nov 2009	Using Simple SE with a preamp Is there anything that should be changed in the stock circuit when running it with a preamp? Using either solid state or tube.

19th January 2010, 10:06 AM	#2
SGregory diyAudio Member Join Date: Apr 2003 Location: Southern Tier NY	Nope. Just watch if your preamp has alot of gain that you are not clipping the amp when trying to play it louder. If it is permanent then you could eliminate the volume pot, not required though. I like to use my preamp with the SSE using CFB. I get the gainback. __________________ Living Life Doing the Waltz in 4/4 meter.

19th January 2010, 03:21 PM	#4
rknize All the best stuff comes from Chian diyAudio Member Join Date: Feb 2009 Location: Chicagoland	The SSE has a plenty of gain, so a pre is not needed to put the amp into clipping from typical "line level" sources. How much gain does your preamp have? __________________ Russ http://www.knizefamily.net/russ/cate...ics/tubeaudio/

20th January 2010, 03:00 PM	#6
rknize All the best stuff comes from Chian diyAudio Member Join Date: Feb 2009 Location: Chicagoland	That would reduce the gain. How much depends on what operating point you choose. __________________ Russ http://www.knizefamily.net/russ/cate...ics/tubeaudio/

26th August 2011, 12:39 AM	#9
rknize All the best stuff comes from Chian diyAudio Member Join Date: Feb 2009 Location: Chicagoland	12BH7 is a suitable substitute, but it requires a different set point on the CSS to operate it in its most linear region. Russ __________________ Russ http://www.knizefamily.net/russ/cate...ics/tubeaudio/

19th January 2010, 11:52 AM	#3
gasser-dude diyAudio Member Join Date: Nov 2009	Sounds good! I have no volume pot and always use it with a preamp. I have a tube pre that is uses a 6dj8 and a 6ns7 but it has to much gain about 1 click on the alps 50k pot and she is to loud. Need to do some looking into on that. Thanks

20th January 2010, 11:57 AM	#5
Skorpio diyAudio Member Join Date: Mar 2004 Location: Denmark	Can the current source at the input tube anode be replaced by a resistor if the gain is to high? Will it affect performance (other than PSRR) compared to CCS?

20th January 2010, 03:21 PM	#7
Davec113 diyAudio Member Join Date: Jul 2007	I have a high-gain tube preamp that I like, so I built the Simple SE without a volume pot and used a JJ ecc99 / 12bh7 driver tube. It has a lot less gain than the at7. I posted about it in a thread about driver tubes in this forum.

25th August 2011, 09:33 AM	#8
webby diyAudio Member Join Date: Jul 2004 Location: england	Hi all, I am a little confused about the lowering the gain on my simple se. I am using a 26 DHT pre amp, and finding the gain too high on the SSE. What input valves can i drop in place to lower the gain, and any components i need to change on the PCB? Is the 12bh7 such a tube? Thanks Ian

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