12ax7 preamp,need help.

[digi01]

I have a couple of 12AX7LPS tubes, plan make a preamp.have what propose?

 

[analog_sa]

Get different tubes.

 

[Frank Berry]

What type of preamp? Phono or a basic system control preamp.

 

[analog_sa]

These days when people say preamp they mean line stage. The 12AX7 is probably suitable for phono duties but quite pointless in a line stage.

 

[digi01]

thanks for reply🙂

I plan to make a line stage,A lot of friends around me say that 12AX7LPS are adjusted very badly,but the sound is very fine,very warm.

This is my sch,any suggestions?

 

[fdegrove]

Hi,

The cap after the 6X4 is really high, about 10µF should be a lot safer.

Cheers,😉

 

[digi01]

sure,thank you.

-digi

 

[cogsncogs]

The cap after the 6X4 is really high, about 10µF should be a lot safer.

Yes definitely change that cap. Should sound nice and warm and fuzzy!

Enjoy!
Wayne 😉

 

[Alastair E]

12ax7

Personally, I would go for the 6SN7gt, or the 6SL7gt if you need that extra gain, the 12ax7 aint a great valve, a bit prone to microphonics, Changed dosens of them over the years!

The 6sn7/6sl7 have a great reputation it seems, but they are an International Octal 8 pin, and benefit from DC heaters to reduce injected hum, especially in phono stages!

 

[isak0411]

Re: 12ax7

Personally, I would go for the 6SN7gt, or the 6SL7gt if you need that extra gain, the 12ax7 aint a great valve, a bit prone to microphonics, Changed dosens of them over the years!

The 6sn7/6sl7 have a great reputation it seems, but they are an International Octal 8 pin, and benefit from DC heaters to reduce injected hum, especially in phono stages!

Hi, alastair
can i use 6sn7 for phono stage & 12ax7 for line stage?

isak0411

 

[fdegrove]

Hi,

Hi, alastair
can i use 6sn7 for phono stage & 12ax7 for line stage?

Not Alastair but the other way around would be a much better place to start.

Cheers, 😉

 

[isak0411]

Hi,



Not Alastair but the other way around would be a much better place to start.

Cheers, 😉

fdegrove ,
so 12ax7 for phono stage 6sn7 for line stage, tnx. fdegrove

isak0411

 

[fdegrove]

Hi,

That's it.

Cheers,😉

 

[digi01]

thank you isak0411.

This is my tube, who used this brand? 12 ax7lpses seem to be low-voltage one.