CCS plate follower 12bh7 schematic needed pls

milen007 · 15th January 2011, 01:50 PM

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

SGregory · 15th January 2011, 02:41 PM

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.

milen007 · 15th January 2011, 03:25 PM

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

cjkpkg · 15th January 2011, 03:57 PM

SimpleSE Schematic

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...

DF96 · 15th January 2011, 05:08 PM

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?

euro21 · 15th January 2011, 06:44 PM

12BH7 preamp, 15mA CCS.

DF96 · 15th January 2011, 06:53 PM

12BH7, but not an anode follower, just a normal grounded-cathode stage.

euro21 · 15th January 2011, 07:15 PM

True.

euro21 · 15th January 2011, 09:37 PM

Is this correct?

milen007 · 01:28 AM

Quote:

Originally Posted by DF96

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

15th January 2011, 01:50 PM	#1
milen007 diyAudio Member Join Date: Dec 2007	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

15th January 2011, 02:41 PM	#2
SGregory Tubie Noobie diyAudio Member Join Date: Apr 2003 Location: Southern Tier NY	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. __________________ Living Life Doing the Waltz in 4/4 meter.

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15th January 2011, 03:25 PM	#3
milen007 diyAudio Member Join Date: Dec 2007	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

15th January 2011, 03:57 PM	#4
cjkpkg diyAudio Member Join Date: Aug 2008 Location: Roswell GA	SimpleSE Schematic 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...

15th January 2011, 05:08 PM	#5
DF96 diyAudio Member Join Date: May 2007	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?

15th January 2011, 06:53 PM	#7
DF96 diyAudio Member Join Date: May 2007	12BH7, but not an anode follower, just a normal grounded-cathode stage.

15th January 2011, 07:15 PM	#8
euro21 diyAudio Member Join Date: Sep 2004 Location: Budapest	True.

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