DIY Tube Preamp

[Peter Daniel]

The out of context parts were moved to a new thread: http://www.diyaudio.com/forums/showt...3008#post83008

[dhaen]

Thank you Peter, thats made it a lot better.

---------I'm gone!-------------

Cheers

[Brett]

you can't simply remove a section of something like that without removing it's meaning, because then it has no context. There were numerous posts before the exised section that were allowed to stand, that contain incorrect ot irrelevant information, yet they are still part of the original thread.

<b>Very poor decision.</b>

[Peter Daniel]

Originally posted by Brett
you can't simply remove a section of something like that without removing it's meaning, because then it has no context. There were numerous posts before the exised section that were allowed to stand, that contain incorrect ot irrelevant information, yet they are still part of the original thread.

<b>Very poor decision.</b>

Brett,

If you point out the posts that contain incorrect or irrelevant information I can further split this thread and make you happy as well.

I just removed all posts that IMHO didn't have anything to do with DIY Tube Preamp.
But I may have been wrong and I will truly appreciate your assistance.

[Ken L]

and for the link.

and for the explanations

helping me along the path

Thanks Frank for your input I will make a wiki for you to respond.

I also noticed your throwing water on the fires - see, this being Enlightened is good for you.

Later

Ken

[FBLEAGH]

great discussion guys

btw do i need matched tubes for this ?

[fdegrove]

Hi,

Not a necessity but it sure won't hurt either.
Always a good thing to have tubes matched.

BTW if there's anything else don't be afraid to ask...
I realize fully that when you post a question to a forum like this you end up with more QQ then answers.

I'd welcome info on your circuit of choice.

Thx,

[FBLEAGH]

Well i've decided im gonna try the schmeatic given earlier ( SRPP )

Looks interesting and should be fun to play with.

But jsut for interests sakewhat would you consider the best preamp design ?? i know it very much to a persons tastes but just wondering I figure the more i ask the more i learn

[fdegrove]

Hi,

Let's narrow it down:

SRPP preamp is fixed.
I'll present you the best accompanying PSU and guidance with the help of our co-members.

But jsut for interests sakewhat would you consider the best preamp design ?? i know it very much to a persons tastes but just wondering I figure the more i ask the more i learn

You will learn along the university of life.

Bear with me,we're going to design you a preamp that's pretty close to what you can possibly imagine as being the best.
If your on a budget you better set your posts now so we know where to cut corners.
After all cutting the right corners is where the ultimate engineering challenge lies.

Ken L:

Isn't this what you want?

It's a great opportunity to at least learn a bit a long the way.

I'll see tomorrow if such a project has been run before and if not we'll give it a go.

Cheers,

[Brett]

Originally posted by FBLEAGH
great discussion guys

btw do i need matched tubes for this ?

No, you don't need matched tubes, but like Frank says, they certainly don't hurt.

However (you knew this was coming didn't you?) there's matching, and then there's matching. Most tubes you buy matched, are out on a simple tester, or test jig, and are "matched" if the anode current falls within a specified percentage, so if your circuit uses substantially different operating points to the tester's rig, they may not still be matched in your circuit. The better tube sellers use a curve tracer like a Sofia to trace the curves over a large varation of operating points and then computer match to a certain percentage over the whole range of the curves.

At <a href="http://www.diyhifisupply.com/tube_supplies/tube_supplies.html">diyhifisupply</a> there is a more detailed explanation of this with curves to show as examples. If it were me and I didn't have any 6SN7's, before I went playing pot luck with dealers or (gasp!) ebay, I'd look at the <a href="http://www.diyhifisupply.com/tube_supplies/china_nos_tubes.html">Chinese Military NOS 6N8P</a> they have there. By all accounts they are excellent at good prices. The owner of the store Brian posts here (bcherry) and is great to deal with. [no affiliation but satisfied customer]

Another great source is Gintaras at <a href="www.kwtubes.com">KW Tubes</a>. Again excellent to deal with, and fast delivery. Sells Russian tubes and passive parts.

Please post your findings about the circuit when completed.

Cheers