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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: Actually... posted by RC Daniel on July 5, 2012 at 00:28:30:
"As for the Miller issues and testing, does running the mu-out of a CCS alter current loops versus not using mu-out."Yes.
"Does the load line change with CCS versus R? "
Yes.
Even a poor CCS will represent a very high impedance. Gary Pimms Self Biased CCS represents more than 2 billion ohms mid band.
The grid resistor (if there is one) of the following stage will determine the load line.
In a direct coupled setup, a driver tube loaded with a CCS will operate into a absolute horizontal load line except where the reactance of the Miller capacitance dictates otherwise.
Because of the high impedance of the CCS, the power supply is not part of the (AC) current loop.
If the mu output is used, 1/2 of any current needed to drive the Miller of the following stage will have to come from the power supply in addition to and above the set current that is already being delivered to the tube through the CCS.
This places the power supply back in the (AC) current loop.
This is why Gary uses a 'CCS feed VR tube shunt regulated power supply' in these instances. (as do I)
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
Edits: 07/05/12 07/05/12 07/05/12
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- RE: Actually... - Tre' 08:35:21 07/05/12 (0)
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