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Old 4th September 2004, 02:07 AM   #1
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Question ECC99 line preamp

Hello everyone,

Is it possible to build a line preamp based on one ECC99 and what is the best operating point with a 260V supply?

Any suggestions?

Thanks!
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Old 4th September 2004, 10:27 PM   #2
zix is offline zix  Sweden
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Well, since the ECC99 is a double triode I suppose you could call Raven a one-tube preamp, even though it uses both triode halves of the tube. It is supposed to be very good, but it won´t be very cheap wid ´dem chokes, input and output transformers. On the other hand, it can drive headphones and you get a balanced out.
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Old 5th September 2004, 05:31 AM   #3
billr is offline billr  New Zealand
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I notice that the raven preamp has a stereo volume control per channel. this is just crappy design.

A single pot wired across the phase and antiphase lines, with the wiper taken to one side is all that is required.

the PSU is also a bit on the complex side for a simple class A amp. As the current take is relatively light, a simple two stage RC coupled PSU filter is all that is required.

kind regards

bill
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Old 5th September 2004, 10:19 AM   #4
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Hi,

If it is just for a line pre-amp with no gain (just as a buffer) it will perform excellent as a cathode follower with a bias current between 5 and 10 mA. Dig through this forum and you will find many examples and discussions.

Cheers
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Old 5th September 2004, 12:21 PM   #5
billr is offline billr  New Zealand
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Hello

you have me beaten with your comments.

The amp has gain, it is not a cathode follower, it is a balanced line stage using a transformer to split then recombine the phases.

The point that I was making is that the volume control is wrong.

That's all.

I don't understand the connection between my post and yours. care to enlighten me?

thanks

bill
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Old 5th September 2004, 09:14 PM   #6
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Hey Bill, dont be such a Bull! Pjotr is answering kooltubes, not you! The subject i using a ECC99 in a line stage.
BTW. Using a single pot between the phases is not a good idea since you load the source at low settngs. I think the Raven design is better than what you suggest. Take that...
Best regards, and Semper Fi!

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Old 5th September 2004, 09:22 PM   #7
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Thanks to all of you.
The Raven looks impressive but seems to be pricey !!!

Anything simpler? The far I can go is tube-rectified PSU and output transformers...I just want to listen to music...lol
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Old 5th September 2004, 09:58 PM   #8
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Hi,

Quote:
I notice that the raven preamp has a stereo volume control per channel. this is just crappy design.
Actually. if you look at the xformer preceding the attenuators you'll notice the grounded CT, the two att. make sure that each winding is loaded properly at all times.

Quote:
Anything simpler? The far I can go is tube-rectified PSU and output transformers...I just want to listen to music...lol
There are much more possibilities if you're willing to go higher on the B+.
I'll post some diagrams later tonight.

Cheers,
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Old 6th September 2004, 01:58 AM   #9
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Default LATER THAT NIGHT....LES SUGGESTIONS DU CHEF.

Hi,

Here are a few diagrams for you to toy with:

Cheers,
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File Type: gif ecc99_small.gif (9.0 KB, 1941 views)
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Old 6th September 2004, 01:59 AM   #10
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Default LE DESSERT....

#2

Cheers,
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