29-10-2012, 08:28 AM
(This post was last modified: 29-10-2012, 08:39 AM by Radio Fixer.)
To me it looks as if the field coil is across the un-smoothed HT but with 250 Ohms in series to earth, which is the the -Ve HT line. The field has C24 across it for some smoothing.
The 250 drops voltage (-7.5V) and so is negatibe w.r.t the -Ve HT line and after some smoothing is used as bias for the valves.
I have a US set where the field coil is across the HT, cant remember which one. Of course they are much more likely to be O/C as the wire used is much thinner and there is a lot more of it.
Gary
The 250 drops voltage (-7.5V) and so is negatibe w.r.t the -Ve HT line and after some smoothing is used as bias for the valves.
I have a US set where the field coil is across the HT, cant remember which one. Of course they are much more likely to be O/C as the wire used is much thinner and there is a lot more of it.
Gary
