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Old 4th January 2011, 03:37 PM   #1
Kmet is offline Kmet  Croatia
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Location: east part of Croatia / Europe
Default 6AU6 in CCS circuits

Hi there..I need some help with making my first all tubed CCS stage. My current preamp circuits consists of 12G4 tube with clasic resistors in cathode. Topology is CF with unity gain. PSU is all valve regulated (EZ80+2xOB2+triode connected EL84 as series pass element). At this moment PSU output voltage is 216V dc. Iwill go in the near future to 301 or 324 volts.
I want to build CCS like following:
But I do not have knowledge for recalculating upper part of schematics to give me aprox 9mA stedy current. Please help me with some advice how to do it...thanx
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Old 4th January 2011, 04:22 PM   #2
DF96 is offline DF96  England
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Join Date: May 2007
You don't calculate, you use the characteristic plots in the 6AU6 datasheet.
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Old 4th January 2011, 04:55 PM   #3
Kmet is offline Kmet  Croatia
diyAudio Member
Join Date: Jan 2011
Location: east part of Croatia / Europe
Default Calculation and drawing

You want to say to me that will be easier way to make design from the begining. OK. I find dataheet on web and make some preliminary drawing of static load lines. I curently use Tungsol datasheet. Stabilizer valve sinks 6mA for stedy glow so if I want to make CCS rest of the current will be 4 or perhaps 5mA...is it that correct? Than I draw 4mA line in Ip/Up diagram and see that if I try to make operating point on 4mA and let it say 100V plate voltage I need first grid voltage of -1,25V and after some calculation gives me cathode resistor value of 312,5ohms.
Do I make my calculations and drawing correctly?
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