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Newbie Tube Pre-amp Build

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Magnaryder

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(pair of) SILVER-7t's

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Joined: Fri Mar 09, 2007 1:00 am

Location: Bucyrus, Ohio

Post Wed Oct 24, 2012 7:07 pm

Newbie Tube Pre-amp Build

I've been thinking about this since we built the CarverFest Amplifiers. Although my soldering skills are marginal, I figured since this little pre has so few parts I could manage the construction and manage installing some upgraded parts in the process.

This is the link:

http://diyparadise.com/web/images/stories/ANM7.gif
or
http://diyparadise.com/web/images/stories/yeo5687.gif

This should take you to the schematic I want to use. Now, what I want to do is pray upon those way more knowledgeable than I am to look at this and make some mod/upgrade suggestions, keeping in mind this pre is going to be running my CF amps and the Klipsch speakers.

Here is what I have in mind so far.

In the power supply I want to use a Jensen 47+47uf 500v Cap. Is that close enough to the 50+50uf 500v to work alright or do I need to stick with the JJ can? Next are the 470uf caps that are paralleled with the 470 ohm resistors. Are Muse Caps OK and Mills resistors good here or is there something better? I had planned on Jensen .47uf Caps on the outputs with AN Tantalum resistors all through the signal side. A Goldpoint stepped attenuator and selector switch. The power transformer I planned to get from Edcor and Hammond chokes from Digi-key. I 'finally found covers(thanks James!!!) I found a chassis with a bottom cover that are painted satin black and some tube protectors.

I'm open to ideas from y'all with tube experience. Please don't be bashful:-)
Thanks for giving me a hand!!

ray
Magnaryder

Its going to be used equipment when I sell it, so it may as well be used equipment when I buy it.

Tim deParavicini's E.A.R. Yoshino V20 Integrated Amplifier, Fosgate Signature Phono pre, Lucas Labs 12B4/OD3 LineStage, No. 50 and 51 Carverfest Tube amps, Hammond M3 tube amp, Ariston RD-40 Turntable w/ Linn Basik LSV tonearn, Grado Statement Master1 cartridge, Carver TX-8 & 11 tuners, Carver TD-12, Tascam CC-222mkII CD recorder, DBX-3BX & 200xg & 120x, CarverAudio ALV prototypes, Alesis Studio One loudspeakers, Energy Reference 22 Connoisseur, Cambridge Audio Model 8s, The Carver Research DarkStar Sub and Stax Earspeakers.

THIS SPACE FOR RENT...helping the blind to hear, one valve at a time
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packratt

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Joined: Sat Jun 25, 2005 10:00 pm

Post Wed Oct 24, 2012 8:12 pm

Re: Newbie Tube Pre-amp Build

Take a look at these kits.

http://www.tubes4hifi.com/home.html
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Magnaryder

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(pair of) SILVER-7t's

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Location: Bucyrus, Ohio

Post Wed Oct 24, 2012 9:49 pm

Re: Newbie Tube Pre-amp Build

Cool stuff, but I think I want to build at least 1 small pre. Maybe for my office system. Like the models with tone controls though.

Been digging the Audio Note kits also. Way Kool!!!

ray
Magnaryder

Its going to be used equipment when I sell it, so it may as well be used equipment when I buy it.

Tim deParavicini's E.A.R. Yoshino V20 Integrated Amplifier, Fosgate Signature Phono pre, Lucas Labs 12B4/OD3 LineStage, No. 50 and 51 Carverfest Tube amps, Hammond M3 tube amp, Ariston RD-40 Turntable w/ Linn Basik LSV tonearn, Grado Statement Master1 cartridge, Carver TX-8 & 11 tuners, Carver TD-12, Tascam CC-222mkII CD recorder, DBX-3BX & 200xg & 120x, CarverAudio ALV prototypes, Alesis Studio One loudspeakers, Energy Reference 22 Connoisseur, Cambridge Audio Model 8s, The Carver Research DarkStar Sub and Stax Earspeakers.

THIS SPACE FOR RENT...helping the blind to hear, one valve at a time
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radioeng2

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Location: E TN

Post Tue Nov 27, 2012 11:27 am

Re: Newbie Tube Pre-amp Build

For those interesting in the idea of building their own tube preamp, here is a video with some good basic info.

http://www.youtube.com/watch?v=mrMGGHp8yLk&feature=youtu.be

This is not a detailed parts value design guide. Just a what it is and what it's purpose is. This is meant to be an ongoing series with more info coming. Roger Modjeski is one of the tube gods if you don't know of him.

Another thought is if you want to start a tube preamp project and help to keep it kind of simple, here is a way to do a power supply in a simple and reasonably decent way. Use this HV DC output supply....

http://www.mpja.com/prodinfo.asp?number=8530+PS

This is an adjustable supply that will get you up to about 270vdc. Not hard to get a preamp that uses that or lower for B+. That brick and a filament transformer and you have your voltage supplies.

You start to lose the simplicity, but putting those two things in a seperate box and you've got a PS that could be reused if you redesign. Preamps are good to have in seperate chassis if you don't mind the extra work. If going with one chassis, just use space to your advantage and don't crowd things.

OK....two project thought starters. Who's going first???? Great winter project!

Mark
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Magnaryder

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(pair of) SILVER-7t's

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Post Tue Nov 27, 2012 5:30 pm

Re: Newbie Tube Pre-amp Build

radioeng2 wrote:OK....two project thought starters. Who's going first???? Great winter project!

Mark


I have ordered all of the parts for my build(most have already arrived).....except the chassis. I'm planning on roughing it together and getting it to work, then figuring out how much space I really need and then ordering the chassis. I've bought 2 sets of parts. 1 build will be on the cheap while the other will have some boutique parts. I've got some Mills and AN resistors, Jenzen, Relcap, and Auricap caps in the signal side(to see what this deaf guy can really hear) and I found some gawd awfully expensive BlackGate and Jenzen caps for the power side. I'm going to try using both sides of 2 5687s in the pre to get back the 20db I'll lose inserting the passive tone controls.

ray
Magnaryder

Its going to be used equipment when I sell it, so it may as well be used equipment when I buy it.

Tim deParavicini's E.A.R. Yoshino V20 Integrated Amplifier, Fosgate Signature Phono pre, Lucas Labs 12B4/OD3 LineStage, No. 50 and 51 Carverfest Tube amps, Hammond M3 tube amp, Ariston RD-40 Turntable w/ Linn Basik LSV tonearn, Grado Statement Master1 cartridge, Carver TX-8 & 11 tuners, Carver TD-12, Tascam CC-222mkII CD recorder, DBX-3BX & 200xg & 120x, CarverAudio ALV prototypes, Alesis Studio One loudspeakers, Energy Reference 22 Connoisseur, Cambridge Audio Model 8s, The Carver Research DarkStar Sub and Stax Earspeakers.

THIS SPACE FOR RENT...helping the blind to hear, one valve at a time
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radioeng2

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Post Tue Nov 27, 2012 9:15 pm

Re: Newbie Tube Pre-amp Build

Here is an example of using that $50 adjustable PS brick in a power supply for a preamp.

Front with seperate Filament and B+ switching
Image

Rear side with IEC, fusing, PS output connector and metering test points
Image

Interior with adjustable HV B+ supply and regulated DC filament side
Image

DC filaments is a level that isn't absolutely required and as you can see adds complexity and space requirement. Something to consider carefully is when adding things for higher quality or taking on not absolutely required features, is that it can really add to the effort you have to go to. Drilling mounting screw holes, wiring things in, buying materials. Figuring out mounting and spacing. And so on....

It's easy to be think high going in. But harder to bring to the finish line. Balance desire versus actual needs versus performance.

Mark
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OconeeOrange

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Post Tue Nov 27, 2012 10:12 pm

Re: Newbie Tube Pre-amp Build

Good fun and great reading.

Keep updating this --please!
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radioeng2

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Post Thu Dec 06, 2012 10:26 pm

Re: Newbie Tube Pre-amp Build

Roger Modjeski has posted the second in his intended series on building with tubes. This one focuses on the tube itself.

http://www.youtube.com/watch?v=z46PInHdmXI

Basics are important!

Mark
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Magnaryder

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Post Fri Dec 07, 2012 7:20 pm

Re: Newbie Tube Pre-amp Build

radioeng2 wrote:Roger Modjeski has posted the second in his intended series on building with tubes. This one focuses on the tube itself.

http://www.youtube.com/watch?v=z46PInHdmXI

Basics are important!

Mark


When I have time I've been reading from this link.

tscm.com/NEETS-v06-Tubes.pdf

ray
Magnaryder

Its going to be used equipment when I sell it, so it may as well be used equipment when I buy it.

Tim deParavicini's E.A.R. Yoshino V20 Integrated Amplifier, Fosgate Signature Phono pre, Lucas Labs 12B4/OD3 LineStage, No. 50 and 51 Carverfest Tube amps, Hammond M3 tube amp, Ariston RD-40 Turntable w/ Linn Basik LSV tonearn, Grado Statement Master1 cartridge, Carver TX-8 & 11 tuners, Carver TD-12, Tascam CC-222mkII CD recorder, DBX-3BX & 200xg & 120x, CarverAudio ALV prototypes, Alesis Studio One loudspeakers, Energy Reference 22 Connoisseur, Cambridge Audio Model 8s, The Carver Research DarkStar Sub and Stax Earspeakers.

THIS SPACE FOR RENT...helping the blind to hear, one valve at a time
<<

Magnaryder

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(pair of) SILVER-7t's

Posts: 2088

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Location: Bucyrus, Ohio

Post Thu Dec 13, 2012 7:29 pm

Re: Newbie Tube Pre-amp Build

I've been reading here for those of you browser delayed

http://diyaudioprojects.com/Solid/12AU7 ... dule-6.pdf

ray
Magnaryder

Its going to be used equipment when I sell it, so it may as well be used equipment when I buy it.

Tim deParavicini's E.A.R. Yoshino V20 Integrated Amplifier, Fosgate Signature Phono pre, Lucas Labs 12B4/OD3 LineStage, No. 50 and 51 Carverfest Tube amps, Hammond M3 tube amp, Ariston RD-40 Turntable w/ Linn Basik LSV tonearn, Grado Statement Master1 cartridge, Carver TX-8 & 11 tuners, Carver TD-12, Tascam CC-222mkII CD recorder, DBX-3BX & 200xg & 120x, CarverAudio ALV prototypes, Alesis Studio One loudspeakers, Energy Reference 22 Connoisseur, Cambridge Audio Model 8s, The Carver Research DarkStar Sub and Stax Earspeakers.

THIS SPACE FOR RENT...helping the blind to hear, one valve at a time
<<

Magnaryder

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(pair of) SILVER-7t's

Posts: 2088

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Location: Bucyrus, Ohio

Post Sat Feb 09, 2013 4:01 pm

Re: Newbie Tube Pre-amp Build

I am ready to begin my pre build. All of the parts(except tubes) are finally here. I'll be posting pics of the parts later today. On another front I've been in contact with one of the DarkStar engineers. I have a copy of the logo and some supplemental information including some specifics of cabinet design and performance level. It has strong similarities to Sunfire subs.

I'm going to be laying the pre out and figuring where each part is going to belong in the chassis. Pics should follow each step along the way. Constructive criticism VERY WELCOMED!!!

ray
Magnaryder

Its going to be used equipment when I sell it, so it may as well be used equipment when I buy it.

Tim deParavicini's E.A.R. Yoshino V20 Integrated Amplifier, Fosgate Signature Phono pre, Lucas Labs 12B4/OD3 LineStage, No. 50 and 51 Carverfest Tube amps, Hammond M3 tube amp, Ariston RD-40 Turntable w/ Linn Basik LSV tonearn, Grado Statement Master1 cartridge, Carver TX-8 & 11 tuners, Carver TD-12, Tascam CC-222mkII CD recorder, DBX-3BX & 200xg & 120x, CarverAudio ALV prototypes, Alesis Studio One loudspeakers, Energy Reference 22 Connoisseur, Cambridge Audio Model 8s, The Carver Research DarkStar Sub and Stax Earspeakers.

THIS SPACE FOR RENT...helping the blind to hear, one valve at a time
<<

angelod307

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Joined: Sat Jun 06, 2009 10:56 pm

Location: manning, sc

Post Sat Feb 09, 2013 11:18 pm

Re: Newbie Tube Pre-amp Build

you can do it.......you can do it all night long.....go RAY!!!!!
CarverFest: I just go for the arts and crafts
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radioeng2

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Location: E TN

Post Sun Feb 10, 2013 11:29 am

Re: Newbie Tube Pre-amp Build

Ok...Feeling like what I'm throwing in is again not exactly right to be in Ray's thread here. But we don't have much of a DIY or tube build area.

But if you missed out on the CF tube amp build, you're not sure where to start with doing anything with tubes, then here may be an option for you. This is part of the on going series that I've mentioned above.

Roger Modjeski is now working on putting out a small tube amp breadboard amp project. Looks like you'll have to join his forum right now to get access, but it could be an avenue to getting started for some.

Youtube video here...
http://www.youtube.com/watch?v=7qg9ot20EdA

Thread here...
http://www.audiocircle.com/index.php?topic=113764.0

The forum link is...
http://www.audiocircle.com/index.php?board=124.0

Mark
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Magnaryder

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(pair of) SILVER-7t's

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Location: Bucyrus, Ohio

Post Sun Feb 10, 2013 12:53 pm

Re: Newbie Tube Pre-amp Build

radioeng2 wrote:Ok...Feeling like what I'm throwing in is again not exactly right to be in Ray's thread here. But we don't have much of a DIY or tube build area. Mark


James, can we(you) build a DIY tubes and SS section on the Forum? Mark, Jesse and some other have possess a large knowledge base that I'd like to take advantage of and I'm sure other would also.

Thanks!!

ray
Magnaryder

Its going to be used equipment when I sell it, so it may as well be used equipment when I buy it.

Tim deParavicini's E.A.R. Yoshino V20 Integrated Amplifier, Fosgate Signature Phono pre, Lucas Labs 12B4/OD3 LineStage, No. 50 and 51 Carverfest Tube amps, Hammond M3 tube amp, Ariston RD-40 Turntable w/ Linn Basik LSV tonearn, Grado Statement Master1 cartridge, Carver TX-8 & 11 tuners, Carver TD-12, Tascam CC-222mkII CD recorder, DBX-3BX & 200xg & 120x, CarverAudio ALV prototypes, Alesis Studio One loudspeakers, Energy Reference 22 Connoisseur, Cambridge Audio Model 8s, The Carver Research DarkStar Sub and Stax Earspeakers.

THIS SPACE FOR RENT...helping the blind to hear, one valve at a time
<<

Magnaryder

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(pair of) SILVER-7t's

Posts: 2088

Joined: Fri Mar 09, 2007 1:00 am

Location: Bucyrus, Ohio

Post Sat May 04, 2013 9:44 pm

Re: Newbie Tube Pre-amp Build

here's a link to pics of my parts layout for the M&M 5687 pre build.

http://www.flickr.com/photos/fotosnap/

I haven't had time to even start working on the build yet , work has intruded as usual. I bought a Lightstar Direct pre chassis from one of Bob's engineers to use for my build. $50 shipped, and it's way cheaper than anything else I'd found.

ray
Magnaryder

Its going to be used equipment when I sell it, so it may as well be used equipment when I buy it.

Tim deParavicini's E.A.R. Yoshino V20 Integrated Amplifier, Fosgate Signature Phono pre, Lucas Labs 12B4/OD3 LineStage, No. 50 and 51 Carverfest Tube amps, Hammond M3 tube amp, Ariston RD-40 Turntable w/ Linn Basik LSV tonearn, Grado Statement Master1 cartridge, Carver TX-8 & 11 tuners, Carver TD-12, Tascam CC-222mkII CD recorder, DBX-3BX & 200xg & 120x, CarverAudio ALV prototypes, Alesis Studio One loudspeakers, Energy Reference 22 Connoisseur, Cambridge Audio Model 8s, The Carver Research DarkStar Sub and Stax Earspeakers.

THIS SPACE FOR RENT...helping the blind to hear, one valve at a time
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