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-   -   C3M linestage (http://www.diyaudio.com/forums/tubes-valves/149080-c3m-linestage.html)

costa23 21st August 2009 12:47 AM

C3M linestage
 
I wanna build the C3M linestage in triode mode.
Does anyone have the good scheme....
Please.....

Thanks


Regards,


Hendra

commstech 21st August 2009 03:08 AM

why not just use a triode ?

dsavitsk 21st August 2009 03:32 AM

Quote:

Originally Posted by costa23 (Post 1903886)
I wanna build the C3M linestage in triode mode.
Does anyone have the good scheme....
Please.....

What sort of gain/Zout do you need? I have used them with a CCS load and a parafeed OPT which seems to work well.

Quote:

Originally Posted by commstech (Post 1903950)
why not just use a triode ?

Because it is a really linear tube as a triode, and because there are few, if any, triodes that have similar specs.

costa23 21st August 2009 09:03 AM

i wanna build this c3m with anode follower (RC) topology.
i will use this preamp with 6sn7-300b single ended (JE lab design).
I've heard that this tube sound great as triode, so i wanna try to build one.
My plan is B+ 300V

Please help

thanks


Regards,


hendra

costa23 21st August 2009 09:04 AM

i wanna build this c3m with anode follower (RC) topology.
i will use this preamp with 6sn7-300b single ended (JE lab design).
I've heard that this tube sound great as triode, so i wanna try to build one.
My plan is:

B+ 300V
Vp 150V
Rp 22 K
Ip 7 mA
Rk 0.5 K
Bias -6 V
How about that....

Please help

thanks


Regards,


hendra

Klimon 21st August 2009 09:58 AM

Do you need a pre with the JElabs?

Swapping the 6sn7 cascade with a c3m as pentode could be worthwile though...

Just my blabla

Simon

costa23 21st August 2009 10:17 AM

thanks for your comment
i think the je labs gain is not high enough...

Klimon 21st August 2009 11:28 AM

Quote:

Originally Posted by costa23 (Post 1904108)
thanks for your comment
i think the je labs gain is not high enough...

Unless I'm very mistaken, it should be able to drive the 300b's into clipping.

See here for distortion comparison between c3m pentode and 6sn7 cascade: http://www.pmillett.com/pentodes.htm

Should you be interested, schematics for c3m + 300b amps can be found here:

http://www.fortunecity.com/rivendell...cy/Legacy.html

http://www.diyparadiso.com/sedesign1.htm

Edit: Millett's page does not feature the c3m, but the measurements of other high-gm pentodes should give you a basic idea...

Simon

dsavitsk 21st August 2009 05:45 PM

I think I'd swap the tubes around. Use the C3m to drive the 300B and use the 6sn7 somewhere else.

DHT112A 22nd August 2009 12:08 AM

Use the C3m in triode with a CCS to drive the 300B and you won't be disappointed. In my opinion the 6SN7 is a gutless driver.


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