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Old 24th October 2007, 12:50 AM   #1
240z4u is offline 240z4u  United States
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Default 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
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Old 24th October 2007, 12:58 AM   #2
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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
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Old 24th October 2007, 01:47 AM   #3
240z4u is offline 240z4u  United States
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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
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Old 24th October 2007, 11:51 AM   #4
euro21 is offline euro21  Hungary
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Default 12B4A+CCS

Try C4S.
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File Type: gif 12b4a-linestage(ccs).gif (80.9 KB, 655 views)
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Old 24th October 2007, 01:01 PM   #5
240z4u is offline 240z4u  United States
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Thanks guys!

Evan
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Old 24th October 2007, 06:44 PM   #6
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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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Old 24th October 2007, 06:51 PM   #7
MikeR is offline MikeR  United States
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Default Another CCS 12B4

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.
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File Type: jpg 12b4 pre with 10m45s ccs.jpg (35.6 KB, 534 views)
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Old 24th October 2007, 06:53 PM   #8
MikeR is offline MikeR  United States
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Default And Another one

A completely different type of CCS for 12B4 linestage. Again, not my work and I have not tried it.
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File Type: gif bbeck-12b4-pre.gif (13.1 KB, 504 views)
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Old 24th October 2007, 10:11 PM   #9
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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
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