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Old 30th December 2001, 03:23 AM   #1
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Join Date: May 2001
Default line pre amp

I would like to build a tube based line amp, nothing too fancy but
with a great sound, an extended frequency responce, will match a ss amp input and not a kit. I have on hand a number of ecc81's.But I am willing to look at circuits using any other tubes/valves.
I have had a quick look at a number of sites but cannot find anything suitable.
Can anyone with experience of building such a project please point me in the right direction.
Many thanks
Phil.
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Old 30th December 2001, 03:33 AM   #2
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Location: Columbia, SC
For starters, try www.tubecad.com

Grey
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Old 30th December 2001, 04:14 AM   #3
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Thanks Grey, got some ideas from the site but I would like to talk to someone who has a circuit up and running and is willing to tell me how it sounds etc.
Phil.
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Old 30th December 2001, 04:38 AM   #4
bawang is offline bawang  Malaysia
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Location: Malaysia
Lightbulb 12AX7?

From someone who's a green horn on tubes (but likes that sexy glow, and hates the output transformers on the tube power amps), what about a design based on the 12AX7 (or equivalent) series?

This may seem to be the solution for a tube sound but with the grunt of solid state for the power amp! Correct me if I'm wrong........
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Old 30th December 2001, 06:46 AM   #5
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Bawang
Thanks...yes..do you have a circuit please?
Phil.
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Old 30th December 2001, 07:24 AM   #6
bawang is offline bawang  Malaysia
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Phil, I was actually asking for a design..... I'm wishing some kind soul out there somewhere can supply (to us) a good sounding & easy to built design.... Sorry to have misled you.
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Old 30th December 2001, 01:14 PM   #7
stigla is offline stigla  Norway
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Location: Trondheim
Hello phil

I have a great page to recomend you. This article discribes a simple circuit with 12 different tubes suggested, and power supply. I think this is JUST what you are looking for. Figure 2 in the article would be my choise of circuit, but it inverts the signal. This is really no problem because you can compensate by switching the + and - on the speakers. All the tubes on the list ar well known and used by many.
http://www.users.globalnet.co.uk/~valveamp/

Your 81's can easily be used, check out
http://members.tripod.com/~gabevee/mytubamp.html
to learn how you can set up your own circuit from the ecc81.


-stig
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Old 30th December 2001, 06:59 PM   #8
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Stigla
Thank you. Excellent information here and plenty to experiment with.
Phil
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Old 30th January 2002, 09:35 AM   #9
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Cool Line preamp

Look this:
http://www.velleman.be/Downloads/0/Manual_K8020.pdf
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Old 31st January 2002, 01:02 PM   #10
dice45 is offline dice45  Germany
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Location: Munich, Bavaria
Hello Phil and Stig,



Quote:
Originally posted by stigla

I have a great page to recomend you. This article discribes a simple circuit with 12 different tubes suggested, and power supply. I think this is JUST what you are looking for. Figure 2 in the article would be my choise of circuit, but it inverts the signal. This is really no problem because you can compensate by switching the + and - on the speakers. All the tubes on the list ar well known and used by many.


http://www.users.globalnet.co.uk/~valveamp/


when I read that Phil is intending to use the ECC81, I was tempted to disrecommend it as I had many occasions to listen to amps using this tube and none of them was sounding particularly pleasant or musical.

But as I had no tried schematic to contribute, I stood mute.



I followed the link and the 1st coming to attention was Simon Shilton's name. I know him as a transformer designer and he certainly is not sitting on his ears. I would follow his recommendations w/o hesitating.



I observed he does NOT have the ECC81 in his list of recommended tubes. But he has the 6CG7 (noval/miniature9 socket version of the 6SN7), the 6SN7, the ECC82 and the 5687 in his list, and I know all these tubes make gorgeous music. The 5687 also fits for this but is a lil'bit high transconductant and I would rather use it with an output transformer. This is running at my place at the moment, just magic.



Phil, my hint, keep the ECC81 as a deterioating example to try it out yourself but I would be surprised if you or anyone else prefers the ECC81 to one of the tubes I mentioned; this is not an audio tube and was never designed for that and has been tried out manytimes not to sound that well. (yeah, I know, the 5687 also was not deisgned for audio and was widely used in tube computers, but it has been tried out to sound gorgeous.)
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Greets,
Bernhard
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