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In Reply to: RE: CCS for 6SN7 driver tube posted by sideliner on June 20, 2016 at 13:14:54
Hi i am not using an interstage trans just an input trans to split the signal.
Follow Ups:
Sorry, my bad, I misunderstood. I guess the simplest CCS solution would be the IXYS 10M45. Another option could be two DN2540 mosfets in cascode and yet another option is the gyrator. Sorry but I don't have any specific circuits to provide you with. If you go the resistive loading option, Schade feedback would not be advisable since it lowers the input impedance of the driven tube and loads down the driver. Schade works well with pentodes since they act as current sources.
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Here's the manufacturer's data sheet
http://ixdev.ixys.com/DataSheet/98704.pdf
Fig. 2 from the data sheet is what you will use to find the current sense resistor for a given current through the 6SN7. For example if you decide on 8 mA as the standing current for the driver, you'd use a 360 Ohm resistor on top of the tube.
Here's a design implementation as seen in Tubelab's SSE
http://www.tubelab.com/images/AssemblyManualSimpleSE/Simple_SE_Amp_Sch_11-08.jpg
Hope this helps.
If you want to use one with a diff amp, with plate resistors, for push pull you might want to use one in the common cathode (as current sink) instead of the resistor..
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 06/20/16
Correct, putting a CCS at the tail could be a good idea (although some would disagree) as it will force operation into class A for the driver and make this amplification stage a 'series' P-P amplifier.
Here's a cascoded pair of DN2540 mosfets for use at either the plates or the tail.
V1 is a 6N6P? It looks like a pentode in that schematic.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
.
Have Fun and Enjoy the Music
"Still Working the Problem"
The schematic i am following has plate to plate fb from the power tube to the driver. I am using a 100k resistor for that. I dont know if that will mess up the operation of this design.
Can you post your schematic?
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
No offense gents, I am looking for a tried implementation on a 6sn7 driver tube. I don't want to play with it as i am not all that comfortable using SS devices and invariably hook them up wrong. regards, Dak
Dak
How are you going to implement each 6SN7? Are you to use one of the triodes as a voltage amp and the other as a driver for each tube? You have to make up for the voltage gain you are losing in the earlier stage but not having any.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
I am planning to use 1/2 of each 6sn7 for the driver so it will be a very simple 2 stage amplifier. I can also configure it with s 6sl7 driver tube.
Edits: 06/20/16
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