low gain 12ax7 schematic

[bakpaosiomay]

can any one suggest me a schematic?
i search for low gain 12ax7 preamp.
but i dont find any.
i wanted gain under 10
because my amp already have plenty of gain.
i really appreciate if anyone can give me the schematic.
thanks

[Zen Mod]

why 12AX7 ?

mediocre tube in that position ;

it's made for entirely different duties

[bakpaosiomay]

Originally posted by Zen Mod
why 12AX7 ?

mediocre tube in that position ;

it's made for entirely different duties

because i already have the tubes.
beside 12ax i have 5687 and 1pc e88cc too.
any suggestion?

[Brit01]

Low gain tubes would be ones such as 6N6P , 6H30, 5687, all below 20 mu.

5687 will take 12.6 Volts but you would have to rewire for the 6 series.

And all sounding very nice.

12AX7 has an mu of 100!

[bakpaosiomay]

Originally posted by Brit01
Low gain tubes would be ones such as 6N6P , 6H30, 5687, all below 20 mu.

5687 will take 12.6 Volts but you would have to rewire for the 6 series.

And all sounding very nice.

12AX7 has an mu of 100!

can you give me the schematic?
i think we can decrease the gain with feedback?

[Brit01]

J Broskies design reduces the mu.

You could investigate the Aikido to reduce gain.

[Brit01]

http://www.tubecad.com/2004/blog0011.htm

[bakpaosiomay]

Originally posted by Brit01
J Broskies design reduces the mu.

You could investigate the Aikido to reduce gain.

but i only have 1pair 12ax7.
i think its not enough for make aikido.
tqu

[Brit01]

5687 for input tube and 12ax7 for output maybe?

It's a very flexible design. Check out his Glassware site. He sells boards.

[Zen Mod]

search for 5687 line preamp schematics here and on net ;

I abandoned these search in last several years because probably I see them all and I usually make my own things from scratch .

in any case - stage with lower mu tube ( without or with moderate global feedback) will sound much better than any stage with drekload of global feedback

YMMV , as always ......