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Old 11th December 2003, 12:07 PM   #1
Bryan is offline Bryan  United States
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Default 10/10y/801

What does everyone think of these tubes. They seem as though they might make a decent preamp and/or driver stage....

Any personal experience making these triodes sing?
Are any better than others...?

Looking forward to some discussion...

Thanks for the input,

Bryan
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Old 11th December 2003, 01:23 PM   #2
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Hi,

The 10, 10Y (AKA VT25A or 10 Spec.) and the 801 are all poweramp tubes and direct heated as well.

While I could imagine the 10 in a linepreamp I still feel it's kind of overkill.

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Old 11th December 2003, 03:23 PM   #3
Bryan is offline Bryan  United States
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Default This is a start....

Yup.

Ok, agreed it may be a little overkill, but lets say you wanted to build a GOOD (read: longterm project with accumulation of parts over time to help with cost) linestage with medium to high relative gain... What tube compliment would you opt for?

Would you prefer idht or dht for this application?
Rectification?\


Thanks,

Bryan

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Old 11th December 2003, 11:12 PM   #4
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Hi,

Quote:
What tube compliment would you opt for?
Regardless of personal taste and if utter transparency is the goal I'd pick the 12B4A any day of the week.

12BH7A is good as are ECC99s.

Just my opinion though.

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Old 11th December 2003, 11:33 PM   #5
Bryan is offline Bryan  United States
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Default interesting....

I guess it helps to define the goals...


Medium to high gain.
Ability to drive relatively long IC's
"utter" transparancy
available tubes

I am relatively new to DIY, so designing from the ground up is not my strength, but I do LOVE to build. I'm looking for a learning experience, and an AWESOME preamp.

I'll do a search for some schematics, but if you know of anything which stands above the rest, please let me know.

As mentioned before, I'm looking for a relatively long term project. I am a grad student, and therefore the ability to throw down large sums of money at one time is not an option. Having a project like this would make the paycheck sooo much more enjoyable to earn!

Thanks Again for the input,

Bryan
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Old 12th December 2003, 12:09 AM   #6
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Hi,

Quote:
I'm looking for a learning experience, and an AWESOME preamp.
Either way it's going to cost $ssssssss.
So, why not define what you need or want?

First of all you seem to think, like so many others, that you need some gain from the preamp.

With a CDP as a source I'd doubt that and those who think so probably have problems elsewhere.

O.K., with that out of harms way you may still want a little gain and good current drive of the cable and Zin of the amp.

Even lowish gain tubes as the 12B4A will still have a Zout around 1K when used as anode followers, not ideal if you want to drive a transistor amp with a Zin of 10K or lower.

As you can see, the plot thickens by the minute...cheap and tubes just don't go together too well but it's all relative of course.

Cheers,
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Old 12th December 2003, 06:24 PM   #7
Bryan is offline Bryan  United States
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Frank,

I do love a good plot

I've just about finished building some 845 monos. These are what I will be driving with the pre.

I am aware of the cost of building with tubes!!! My wallet is still hurting, but the desire to build on prevails.

I'm not exactly sure how to define what I need as far as the preamp... but would like it to be high quality.

What are the first factors which need definition?

Bryan
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Old 12th December 2003, 06:50 PM   #8
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I built an Ultrapath (transformer coupled) linestage for around $400. Very nice.

My current project is a cathode coupled 5687 linestage.

What kind of price range are you looking for? For CD output you won't need any wild gain unless you are making up for low gain further down the chain.

Kevin
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Old 12th December 2003, 08:58 PM   #9
Bryan is offline Bryan  United States
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Well, I knew this would come up....$$$

As I would intend for this to be a longer term project, total cost could be near $1500. I would imagine I could build a decent amp for this amount

I don't mind spending on iron, as it is an investment!

I guess you guys are correct about the gain, maybe I am oversetimating it's need, thoug please keep in mind that the IC's will be long.

The amp schematic is here:
http://members.bellatlantic.net/~vze32pf2/845.html

It will be done in a few weeks, and I will be using my ARC preamp until I get something together to run them.

Any suggestions as to what you guys think will mate up with them well?

Looking forward...

Bryan
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Old 12th December 2003, 11:38 PM   #10
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Hi,

Quote:
thoug please keep in mind that the IC's will be long.
How long and how capacitive are they?

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