CCS plate follower 12bh7 schematic needed pls - diyAudio
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Old 15th January 2011, 02:50 PM   #1
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Default CCS plate follower 12bh7 schematic needed pls

hi guys

anyone got the schematic of CCS anode follower of 12bh7 to share?

i got pair of 12bh7 and would like to try out. i got zero knowledge in design. but have build a PTP preamp base on working schematic.

thanks in advance

erwin
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Old 15th January 2011, 03:41 PM   #2
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I fyou want to keep it simple for learning and decent performance use a 10M45S. One to220 and two resistors and you have a load. Easy P2P.
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Old 15th January 2011, 04:25 PM   #3
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hi SGregory

thanks for the reply, however my electronic knowledge is very limited though i learn as i go. but i still not sure bout your suggestion.

would you kindly elaborate?

thanks,
Erwin
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Old 15th January 2011, 04:57 PM   #4
cjkpkg is offline cjkpkg  United States
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SimpleSE Schematic
Click the image to open in full size.

Check the Tubelab link to the SimpleSE schematic for HOW to implement for plate loading a 10M45. The above chart guides you to what value resistor you need for the amount of current you desire. ~300 gives you 10mA. ~500 gives you 6mA ect...
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Old 15th January 2011, 06:08 PM   #5
DF96 is offline DF96  England
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If your electronic knowledge is very limited why do you think you need a CCS and anode follower? Is the CCS used to bias it (at the cathode) or load it (at the anode)?

What is the application? What gain and input impedance do you need?
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Old 15th January 2011, 07:44 PM   #6
euro21 is offline euro21  Hungary
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Default 12BH7a PF

12BH7 preamp, 15mA CCS.
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File Type: jpg 12BH7_preamp_CCS_15mA.jpg (118.9 KB, 339 views)
File Type: jpg cCCS.jpg (86.2 KB, 319 views)
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Old 15th January 2011, 07:53 PM   #7
DF96 is offline DF96  England
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12BH7, but not an anode follower, just a normal grounded-cathode stage.
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Old 15th January 2011, 08:15 PM   #8
euro21 is offline euro21  Hungary
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True.
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Old 15th January 2011, 10:37 PM   #9
euro21 is offline euro21  Hungary
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Is this correct?
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File Type: jpg 12BH7_AF_CCS_15mA.jpg (199.0 KB, 293 views)
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Old 16th January 2011, 02:12 AM   #10
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Quote:
Originally Posted by DF96 View Post
If your electronic knowledge is very limited why do you think you need a CCS and anode follower? Is the CCS used to bias it (at the cathode) or load it (at the anode)?

What is the application? What gain and input impedance do you need?
Because my 1st srpp ptp that has gain of 6 is to high for my system

Someone told me that i need a simple stage. He also told me that ccs anode follower will sound better than the simple stage

Checking from web. from John Broskie's Guide to Tube Circuit Analysis & Design, Anode follower ia just adding another stage

http://www.tubecad.com/2007/05/blog0105.htm

I need gain around 2-3. Input impedance is not very important as the cap grom mu dac is big enough. Can handle any reasonable or normal input impedance

Thanks very much

Last edited by milen007; 16th January 2011 at 02:28 AM.
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