tube line preamplifier circuit

[korabetsni]

hello,
I am searching for a tube line preamplifier schematics. Does anybody knows a very good sounding designs? I do not have any tubes so i have no limitation on that.
thank you

[SY]

What sort of preamp are you looking for? Gain? Levels? Impedances?

[scafas]

I built this preamp, and I assure you that sounds really good and it 'easy to build.
with some modifications it can operate at low voltage
http://www.pcb-audio.com/circuiti-st...hema-gomes.jpg

w w w . p c b - a u d i o . c o m

[korabetsni]

hi,
it don't need to be low voltage. I had made a Piaa tube preamp before.Also i can make any transformar needed. I need a line tube preamplifier with low gain, 2-3 would be fine. It will be connected to my diy mosfet amplifier and speakers.
my new diy speakers project

[kevinkr]

Depending on budget you might even want to consider something like a 26 dht transformer coupled line stage.. Low gain (4dB or so) low output impedance, and no concern about leaky coupling caps or long LF time constants putting DC into your solid state amplifier.

The down side is complexity and cost. I'm incidentally running such a pre-amplifier in my system.. Check out the 26 pre-amplifier thread in this forum..

Other good possibilities would be Salas 6V6 based line stage, and SY's Heretical..

[chanmix51]

Hi,

With some friends we have built a tube based I/V converter for DACs wich does not need a preamp.

greg

[korabetsni]

what do you think about this design?
my 6922 / E88CC preamp

[DF96]

Far too much gain? A voltage gain of around 20 would only be needed with a very low output source or a very high input power amp.

[costis_n]

Originally Posted by korabetsni

what do you think about this design?
my 6922 / E88CC preamp

This schematic is of the "Valves make nice distortion" type. Avoid it.

[Original Burnedfingers]

Quote:
Far too much gain? A voltage gain of around 20 would only be needed with a very low output source or a very high input power amp.


I'm really confused here. Too much gain? Do you not have a volume control in which to adjust the level? Can you not make the necessary adjustments to achieve the volume level that is to your liking? Made a 12B4 line stage and the volume control setting was usually around 1:00 for the level that I wanted. Another line stage with more gain would result in a volume control setting of say 10:00 for the same level. Please do tell me what I am missing here. My distortion analyzer results were practically the same despite volume control setting. Are you trying to say that a line stage with lower gain will result in lower distortion? If so my test results have not come up with the same conclusion.