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Old 26th December 2006, 07:09 PM   #1
jduffy is offline jduffy  United States
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Default 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.
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Old 27th December 2006, 01:49 AM   #2
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The thread of all line stage threads Yet another 12B4 line stage, or is the 12B4 better than the Grounded Grid.....
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Old 27th December 2006, 02:39 PM   #3
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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.
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Old 27th December 2006, 08:22 PM   #4
billbo is offline billbo  Australia
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Default 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
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Old 29th December 2006, 04:01 PM   #5
jduffy is offline jduffy  United States
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Default 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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Old 29th December 2006, 05:58 PM   #6
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You could try this one
I have used it for 12 months and it sounds great very low noise indeed.
PSU included.

Steve

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Old 30th December 2006, 06:52 AM   #7
jduffy is offline jduffy  United States
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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.
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Old 1st January 2007, 01:37 AM   #8
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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.
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Old 2nd January 2007, 08:04 PM   #9
jduffy is offline jduffy  United States
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I looked for an Aikido preamp but all I saw was an attenuator.

Is there in fact an Aikido preamp PCB?
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Old 2nd January 2007, 08:20 PM   #10
Nordic is offline Nordic  South Africa
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Yes, and many versions... all the rage these days...
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