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merickrc 25th March 2009 01:57 PM

whats a good diy tube preamp kit
i am looking to add a tube preamp in the future to my system i have as follows turntable and a dynaco st-70 i would like some input for tube preamp to add with volume control

tinitus 25th March 2009 02:15 PM

When it comes to kits, Broskies Aikido will be hard to beat

Brit01 25th March 2009 02:36 PM

I second that. I have a 5687/6N1P kit running and it sounds superb. I love it. A lot of gain though (of course depends which tubes you use). Depends what you are looking for.

I'm collecting parts now for a cathode follower, point to point job.

Also itching to build my first power section!:D

merickrc 25th March 2009 05:26 PM

ok so is that the only kit that you guys would use im new to building amps and preamps so what tubes would you use in this preamp also when i went to the site the preamp is out of stock any other ideas for a preamp

Brit01 25th March 2009 06:21 PM

JB is a busy man. If you can wait a few weeks he will have new stock soon.

His boards are of the highest quality and for me were a great learning experience as the boards are flexible with the choice of tubes you can use and the sizes of components on the board also.
Also jumpers for different heaters and a selection switch for 2 different coupling caps. I use 2 in parallel, PIO and Auricap.

as far as other boards go I can't comment being a newbie myself.

Tubes: depends how much gain you want first. To some extent this is personal preference.

merickrc 25th March 2009 06:41 PM

when you say gain do you mean the amount of signal bost coming from the sorce

boywonder 25th March 2009 07:23 PM

Is your source just a turntable or do you also use line-level inputs (like a CD player, tape, MP3, radio, etc)?

yes, gain is the amount of signal amplification you need from the source. Gain for a phono stage is typically around 100 or so and gain for line level stuff can be 1-30 or so.

I'll also recommend Broskies' Aikido, but It's the only one I've built so my experience is limited.

It's quite well documented all over this forum and is flexible to tube choice, you can use 9-pin mini's or octals (John Broskie (Tubecad) sells both flavor boards), and you can select tubes to get the gain you need.

Keep in mind that this would be a semi-kit, you'll still need to buy/build a chassis, transformer, passive components and other misc parts. Depending on your skill level, this route may or may not be the best first step.

If you just want to build a kit with lots of instructions/documentation and not have to source additional parts, check out bottlehead's tube offerings, among others.

If you want phone inputs and line level inputs you'll need 2 stereo Aikido PCB's (or 4 mono PCB's). The phono input requires much higher gain than line inputs and some other equalization. You could also just build a phono pre (no line level inputs)

merickrc 25th March 2009 10:02 PM

boywonder that sounds good the only thing i will use the preamp for is the turntable but how do i control the volume do i just use a sterio pot

merickrc 25th March 2009 10:14 PM

what do you all think of this kit for a first time tube preamp will it work with my dynaco amp

tinitus 26th March 2009 12:32 AM


Originally posted by merickrc

the only thing i will use the preamp for is the turntable

but how do i control the volume do i just use a sterio pot

Broskies new kit with onboard supply would be nice fore you
And at the price I wouldnt think of anything else

BUT, as you only play vinyl, and do have a nice Dynaco
you might be better suited with a good riia(prepre)
I would think that Broskie could get the right parts together fore you

With the right setup you might even get away with a passive preamp with no switches, and as simple as it gets

Do you use MM or MC, with low or highoutput ?
Or do you already have a nice phono amp(riia), stepup trafos or whatever ?
It really is a very important part in your setup

Question is, have you any clew about how this works at all
I mean, even a simple tubekit does demand some experience

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