CCS for 12B4 linestage

240z4u · 24th October 2007, 12:50 AM

Would this be adequate for a CCS for my 12b4 line stage?

I need to build two correct?

http://home.pacifier.com/~gpimm/self_bias.htm

Thanks alot guys!

Evan

Bandersnatch · 24th October 2007, 12:58 AM

hey-Hey!!!,
You'll need one per 12B4. Suggest using the 'mu' output. The DN2540 cascode is a lot simpler...

Try it with DN3545N3 on the bottom, and a 2540N5 on top to dissipate the heat.
cheers,
Douglas

240z4u · 24th October 2007, 01:47 AM

I looked for the DN2540 stuff that you emailed me about. I could not find it.

Do you have a specific schematic? Easier would be better since this is my first scratch build!

Thanks buddy!

Evan

euro21 · 24th October 2007, 11:51 AM

Try C4S.

240z4u · 24th October 2007, 01:01 PM

Thanks guys!

Evan

resident · 24th October 2007, 06:44 PM

thanks euro21!
I think I'll add this, to my 12B4A preamp!
I have built it a long time ago and I have never changed the anode // resistors

MikeR · 24th October 2007, 06:51 PM

Here's another take on a 12B4 with CCS. This is not my work and I apologize to the author for forgetting its origin. Looks interesting.

MikeR · 24th October 2007, 06:53 PM

A completely different type of CCS for 12B4 linestage. Again, not my work and I have not tried it.

Bandersnatch · 24th October 2007, 10:11 PM

hey-Hey!!!,
With the BJT transistors, getting a mu output is not possible. Since regulated current will get split between cathode and output signal, it might be best to use a bypass capacitor on the cathode resistor. Of course, one could switch between plate output and mu output....I suspect that there will be one that works better given the rest of the system...

cheers,
Douglas

24th October 2007, 12:50 AM	#1
240z4u diyAudio Member Join Date: Dec 2004 Location: Madison WI	CCS for 12B4 linestage Would this be adequate for a CCS for my 12b4 line stage? I need to build two correct? http://home.pacifier.com/~gpimm/self_bias.htm Thanks alot guys! Evan __________________ Yeah... it seemed like a good idea at the time.

24th October 2007, 12:58 AM	#2
Bandersnatch diyAudio Member Join Date: Jul 2003 Location: Ann Arbor, MI	hey-Hey!!!, You'll need one per 12B4. Suggest using the 'mu' output. The DN2540 cascode is a lot simpler... Try it with DN3545N3 on the bottom, and a 2540N5 on top to dissipate the heat. cheers, Douglas __________________ the Tnuctipun will return

24th October 2007, 01:47 AM	#3
240z4u diyAudio Member Join Date: Dec 2004 Location: Madison WI	I looked for the DN2540 stuff that you emailed me about. I could not find it. Do you have a specific schematic? Easier would be better since this is my first scratch build! Thanks buddy! Evan __________________ Yeah... it seemed like a good idea at the time.

24th October 2007, 01:01 PM	#5
240z4u diyAudio Member Join Date: Dec 2004 Location: Madison WI	Thanks guys! Evan __________________ Yeah... it seemed like a good idea at the time.

24th October 2007, 10:11 PM	#9
Bandersnatch diyAudio Member Join Date: Jul 2003 Location: Ann Arbor, MI	hey-Hey!!!, With the BJT transistors, getting a mu output is not possible. Since regulated current will get split between cathode and output signal, it might be best to use a bypass capacitor on the cathode resistor. Of course, one could switch between plate output and mu output....I suspect that there will be one that works better given the rest of the system... cheers, Douglas __________________ the Tnuctipun will return

24th October 2007, 06:44 PM	#6
resident Account Disabled Join Date: Sep 2004 Location: Earth	thanks euro21! I think I'll add this, to my 12B4A preamp! I have built it a long time ago and I have never changed the anode // resistors

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