6sn7 pre

drobert · 19th October 2005, 02:35 PM

hello,

I look for a link to this schematic. Can anybody help me?

drobert

kmtang · 19th October 2005, 03:20 PM

Hi,

Take a look at the JE Lab's line stage. It is very simple but with very good sound.

73
Johnny

kmtang · 19th October 2005, 03:25 PM

Here is the link.

http://members.myactv.net/~je2a3/jelphono.htm

drobert · 20th October 2005, 08:36 AM

Hello Johny

Thanks a lot your answer, but I think that you misunderstanded me.

I look for a web page where there is this scematic because I need to the descreption for this.

drobert

amperex · 20th October 2005, 02:47 PM

When I view a schematic & parts lists of a design, the entire design is automatically converted to my verbal language of english. In other words, I guess I see the trees in the forest, just not the forest itself.

Bandersnatch · 24th October 2005, 01:13 AM

What is unclear?

you have a power supply which will deliver ~240V. The 6SN7 runs its heaters on AC. It has ~6kOhm output Z( excepting where the coupling cap takes over and dominates at lower frequency ).

You should be able to get it working almost anything which is even close to what is described on that schematic.

I'd suggest a higher B+, and double the plate load resistor. 32-34kOhm is a nice load line when B+ is ~440VDC. Drop 250 of those volts across the plate load, for about 6-8 mA.
cheers,
Douglas

19th October 2005, 03:20 PM	#2
kmtang diyAudio Member Join Date: Nov 2004 Location: Vancouver	JE Lab Hi, Take a look at the JE Lab's line stage. It is very simple but with very good sound. 73 Johnny

20th October 2005, 02:47 PM	#5
amperex diyAudio Member Join Date: Feb 2005 Location: MI	I do not understand your reply When I view a schematic & parts lists of a design, the entire design is automatically converted to my verbal language of english. In other words, I guess I see the trees in the forest, just not the forest itself.

24th October 2005, 01:13 AM	#6
Bandersnatch diyAudio Member Join Date: Jul 2003 Location: Ann Arbor, MI	What is unclear? you have a power supply which will deliver ~240V. The 6SN7 runs its heaters on AC. It has ~6kOhm output Z( excepting where the coupling cap takes over and dominates at lower frequency ). You should be able to get it working almost anything which is even close to what is described on that schematic. I'd suggest a higher B+, and double the plate load resistor. 32-34kOhm is a nice load line when B+ is ~440VDC. Drop 250 of those volts across the plate load, for about 6-8 mA. cheers, Douglas __________________ the Tnuctipun will return

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19th October 2005, 03:25 PM	#3
kmtang diyAudio Member Join Date: Nov 2004 Location: Vancouver	Here is the link. http://members.myactv.net/~je2a3/jelphono.htm

20th October 2005, 08:36 AM	#4
drobert diyAudio Member Join Date: Jul 2005 Location: Szombathely	Hello Johny Thanks a lot your answer, but I think that you misunderstanded me. I look for a web page where there is this scematic because I need to the descreption for this. drobert

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