29-11-2017, 07:24 PM
Hi.
I'd say that 245 volts is what I'd be looking for, I would check the total current now. I would think that it would be no more than 45ma (or a bit less) which would be about spot on for a set of this type.
Regarding the resistances of the HT secondary they will be different dependent how they are wound. They would only be the same if the windings were interleaved but this make the transformer more expensive to to wind. I'm sure Ed Dinning would explain far better than myself.
What you have said Mike is what I thought, there is a little drop on the HT winding when the valve is in use, that is normal as you know due to the resistance of the winding but at 175v DC output the valve is either low emission or your pulling too much current, which of course the load isn't, the OE valve is rated at 70ma so as far as I can tell its well down in emission.
I'd say that 245 volts is what I'd be looking for, I would check the total current now. I would think that it would be no more than 45ma (or a bit less) which would be about spot on for a set of this type.
Regarding the resistances of the HT secondary they will be different dependent how they are wound. They would only be the same if the windings were interleaved but this make the transformer more expensive to to wind. I'm sure Ed Dinning would explain far better than myself.
What you have said Mike is what I thought, there is a little drop on the HT winding when the valve is in use, that is normal as you know due to the resistance of the winding but at 175v DC output the valve is either low emission or your pulling too much current, which of course the load isn't, the OE valve is rated at 70ma so as far as I can tell its well down in emission.
