I need help in how to put photographs in these answers.
The picture of the curves on the 833-A at 1kV have near equal spacing for grid voltages vs plate current so it looks linear. I do not have distortion measuring equipment but I understand second order harmonics are not easy to hear in music and it sounds very clear. Of course all 1kV wires must have thick insulation and the anode cap is modified with a collar to prevent the danger of anyone touching the anode, unlike a 3-500Z or a GM-100 which requires an air cooled finned anode cap. You do need to know how to make the power supply with a cage to prevent any access to the power supply parts and you need to ground the output transformer frame which is rated at 4kV. Here is a link to some pictures of it before I connected it to Magnepan 0.7s and replaced the driver transformers with Lundahl LL2765 driver transformers.
The picture of the curves on the 833-A at 1kV have near equal spacing for grid voltages vs plate current so it looks linear. I do not have distortion measuring equipment but I understand second order harmonics are not easy to hear in music and it sounds very clear. Of course all 1kV wires must have thick insulation and the anode cap is modified with a collar to prevent the danger of anyone touching the anode, unlike a 3-500Z or a GM-100 which requires an air cooled finned anode cap. You do need to know how to make the power supply with a cage to prevent any access to the power supply parts and you need to ground the output transformer frame which is rated at 4kV. Here is a link to some pictures of it before I connected it to Magnepan 0.7s and replaced the driver transformers with Lundahl LL2765 driver transformers.