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In Reply to: RE: VR Tube Current posted by Triode_Kingdom on August 15, 2017 at 18:00:08
Don't use a resistor. Instead, use a CCS to control the current in the gas discharge regulator. The 10M45S should be quite adequate in this role.
Eli D.
Follow Ups:
I don't know a way to do that without the CCS contacting the signal's current path. (You know I never do that.) The load in this case is the anode of a cathode follower.
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Buy Chinese. Bury freedom.
The essential 0.068 μF. noise control cap. across the VR tube is the connection to AC ground. The AC impedance of the CCS measures in millions of Ω.
Eli D.
Eli, let me start by saying that I don't want to appear ungrateful for your advice. You have considerable experience both building and designing, and I respect your opinions. Nevertheless, in my mind, quoting the AC impedance of a CCS as a reason why it won't be heard is anomalous to quoting the DC resistance of a coupling cap as a reason why it won't impact the signal at the grid. Any semiconductor that touches the signal creates a risk of sonic contamination. For the same reason that I've decided to design a line stage without an output coupling cap - a complex and time consuming process as it turns out - I won't attach a CCS to the signal path. Maybe this concept is old-fashioned, but I set out on this path years ago, and it has so far served me well. :)
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Buy Chinese. Bury freedom.
You're pretty funny. You'll put opamps into the signal path of your cathode follower, but you won't accept all the benefits of a CCS for your shunt regulated power supply.
If you don't want SS to "contaminate" your tube circuit, use a resistor or choke load for your cathode follower, put a coupling cap in there, and use a resistor or pentode to load your VR tube.
Perhaps you don't understand the circuit. There are no opamps in the signal path. In any event, I've decided not to use a gas regulator for the follower supply.
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Buy Chinese. Bury freedom.
Edits: 08/18/17
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