Need recomdations on a lineamp

[Fuling]

I´m not the one who needs balanced operation, nor do I need 30V into 300 ohms. I just want a little gain...

 

[Sch3mat1c]

Then a 5687, 12AU7 (GASP!), etc. will serve you fine. Even a 12AX7 CF, though you still need something for gain.

Tim

 

[fdegrove]

Hi,

Then a 5687, 12AU7 (GASP!), etc. will serve you fine.

Almost any medium µ tube will have too much gain already and quite likely too high Zo as well.

So why not get creative with the like of 12B4A, 6S4, 6C19P and such?

Cheers,

 

[dave slagle]

Hi,



Almost any medium µ tube will have too much gain already and quite likely too high Zo as well.

So why not get creative with the like of 12B4A, 6S4, 6C19P and such?

Cheers,

or better yet use a transformer... why reinvent a bad sounding wheel??? what next differential Srpp's? split load inverter DC to dual cathode followers???

a pair of 6C45's and a surplus toroid will cost $30, allow a 2V input for full out and fall below 300 ohms, that leaves some money for the rest. (assuming you pay yerself a nickel an hour for time spent)

seems like that solves all the problems...

dave

 

[fdegrove]

Hi,

why reinvent a bad sounding wheel???

What part in my suggestion would be bad sounding, David?

Or am I misreading you?

split load inverter DC to dual cathode followers???

A ton of paralelled 6DJ8s a la CJ perhaps?

Cheers,

 

[Sch3mat1c]

Well if you'd prefer, we can dig out some 8974s...
http://www.cpii.com/eimac/catalog/169218.htm

Tim

 

[dave slagle]

Hi,



What part in my suggestion would be bad sounding, David?

Or am I misreading you?



A ton of paralelled 6DJ8s a la CJ perhaps?

Cheers,

well the 12B4 has an Rp of 1K... we need 300 ohms balanced... how do you get creative and get there?

the 6C19 is like a 6AS7.... the Rp is what 400 ohms and thats when running 100ma.... and the gain is what 2-3??? so you need 5V plus input to get to the needed 30V p-p out...

so i suppose you could use a pair of 12B4's coupled somehow to the 6C19's with a bit of feedback to drop the Zout to the needed value and still meet the required specs with only a quarter an amp of plate current.

as for the paralleled dj8's ... don't you know they sound blurred.

dave

 

[fdegrove]

Hi,

well the 12B4 has an Rp of 1K... we need 300 ohms balanced... how do you get creative and get there?

O.K. I see where the confusion comes from....
We actually have two members here with different requirements for the preamp: Woody and Fuling.

as for the paralleled dj8's ... don't you know they sound blurred.

You know I was only mocking a certain High-End manufacturer.

Cheers,