I've built some amps, need suggestions for a DIY preamp or line stage

jduffy · 26th December 2006, 07:09 PM

I've built a chip amp from scratch, a tube amp from a kit and would now like to build a tube preamp or line stage. Cheaper is better and I found it fun getting good parts for my chip amp at low cost.

It would be nice to find something with three lines in and two lines out. I listen mostly to jazz, blues, and classical.

Can you point me to some good schematics and plans that I should consider for this project?

Thanks for your help.

jaymanaa · 27th December 2006, 01:49 AM

The thread of all line stage threads Yet another 12B4 line stage, or is the 12B4 better than the Grounded Grid.....

kstagger · 27th December 2006, 02:39 PM

I've had good luck with the Ultrapath transformer coupled 6J5 linestage - though power supply design must be carefully designed to minimize hum. On the weird side, I really like the triode connected EF86 and C3m... very musical and they sound a bit different than the usual 12A*7 stuff.

billbo · 27th December 2006, 08:22 PM

If you want to build a simple and good preamp go to this link below. I have posted my scematic which I have built.
Cheers

Valve Pre for Chip Amp

jduffy · 29th December 2006, 04:01 PM

Thank you for the help. I'm still considering options.

If there are more, I'd like to hear them.

Steve Cresswell · 29th December 2006, 05:58 PM

You could try this one
I have used it for 12 months and it sounds great very low noise indeed.
PSU included.

Steve

jduffy · 30th December 2006, 06:52 AM

Thanks for the schematic Steve. I looked up the 6J5 and it sounds like it would work for me as I like good mids and highs as I listen mostly to jazz, blues, and classical.

talaerts · 1st January 2007, 01:37 AM

Well, the aikido (see www.tubecad.com) should be a very good preamp, and it's handy that you can order the very high quality pcb for it.
I have -finally- started building it, using 6GM8 low-voltage tubes (needs a 24V power supply). This uses the 9-pin PCB.

jduffy · 2nd January 2007, 08:04 PM

I looked for an Aikido preamp but all I saw was an attenuator.

Is there in fact an Aikido preamp PCB?

Nordic · 2nd January 2007, 08:20 PM

Yes, and many versions... all the rage these days...

26th December 2006, 07:09 PM	#1
jduffy diyAudio Member Join Date: Oct 2006	I've built some amps, need suggestions for a DIY preamp or line stage I've built a chip amp from scratch, a tube amp from a kit and would now like to build a tube preamp or line stage. Cheaper is better and I found it fun getting good parts for my chip amp at low cost. It would be nice to find something with three lines in and two lines out. I listen mostly to jazz, blues, and classical. Can you point me to some good schematics and plans that I should consider for this project? Thanks for your help.

27th December 2006, 01:49 AM	#2
jaymanaa diyAudio Member Join Date: Jan 2006 Location: Kansas	The thread of all line stage threads Yet another 12B4 line stage, or is the 12B4 better than the Grounded Grid..... __________________ "Make everything as simple as possible, but no simpler" Einstein

27th December 2006, 08:22 PM	#4
billbo diyAudio Member Join Date: Nov 2006 Location: Sydney	valve line stage preamp If you want to build a simple and good preamp go to this link below. I have posted my scematic which I have built. Cheers Valve Pre for Chip Amp

29th December 2006, 04:01 PM	#5
jduffy diyAudio Member Join Date: Oct 2006	Thanks Thank you for the help. I'm still considering options. If there are more, I'd like to hear them.

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27th December 2006, 02:39 PM	#3
kstagger diyAudio Member Join Date: Dec 2003 Location: Grand Rapids	I've had good luck with the Ultrapath transformer coupled 6J5 linestage - though power supply design must be carefully designed to minimize hum. On the weird side, I really like the triode connected EF86 and C3m... very musical and they sound a bit different than the usual 12A*7 stuff.

29th December 2006, 05:58 PM	#6
Steve Cresswell diyAudio Member Join Date: Apr 2006 Location: Yorkshire UK	You could try this one I have used it for 12 months and it sounds great very low noise indeed. PSU included. Steve

30th December 2006, 06:52 AM	#7
jduffy diyAudio Member Join Date: Oct 2006	Thanks for the schematic Steve. I looked up the 6J5 and it sounds like it would work for me as I like good mids and highs as I listen mostly to jazz, blues, and classical.

1st January 2007, 01:37 AM	#8
talaerts diyAudio Member Join Date: Oct 2005	Well, the aikido (see www.tubecad.com) should be a very good preamp, and it's handy that you can order the very high quality pcb for it. I have -finally- started building it, using 6GM8 low-voltage tubes (needs a 24V power supply). This uses the 9-pin PCB.

2nd January 2007, 08:04 PM	#9
jduffy diyAudio Member Join Date: Oct 2006	I looked for an Aikido preamp but all I saw was an attenuator. Is there in fact an Aikido preamp PCB?

2nd January 2007, 08:20 PM	#10
Nordic diyAudio Member Join Date: Sep 2005	Yes, and many versions... all the rage these days...

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