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In Reply to: RE: CCS for 6SN7 driver tube posted by DAK on June 20, 2016 at 12:15:36
This will work very well for driving the output tubes and will help insure good performance, likely with less distortion if you set it up right. In fact if you did it this way you might not need the transformer at all, but of course to do that the CCS would have to have excellent performance. That is the key to getting differential circuits to work right.
The cathode circuit of the two 6SN7s would then be your high quality CCS.
Follow Ups:
Hi Ralph, that was suggested early on but the amp schematic i will use has "Schade" feedback which is from the anode of the power tube to the anode of the driver tube. I am not sure how that would work with a differential amplifier. Part of my planning is to not use a tube phase splitter. cheers, Dak
How a differential amplifier works is one tube section is forced to do the opposite of the other due to the cathodes being coupled together.
As 'phase splitters' go its a pretty elegant approach and does not have the sonic signature associated with most other phase splitter circuits. If you were to drive each half of the differential amplifier with your transformer the result will be lower distortion than if you drove the 6SN7 sections each single-ended.
Did you check out the schematic of the amp i will be copying? The amplifier section will be proceeded by a Lundahl phase splitting input transformer. In my amp i will be using a 6sn7 or 6sl7 for the driver tube. I don't think you can get it any simpler or more efficient than that. cheers, Dak
Set up the way you are describing probably not. I could draw something up though.
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