13-02-2014, 07:18 PM
Right, silly me - the diode is in reverse mode.
The link you gave suggests that loads of British TVs of the 50s and 60s were fitted with diode wattless dropper systems. Is this true? If so I wasn't aware of it. I personally only know of the Thorn sets mentioned in my earlier post.
I recall only once using a zener as a crowbar in conjunction with a 1.4V filament supply, part of a power supply for battery portables. That was fused of course, but the preceding regulator has never failed to this point in time, so just how safe the valves would be in the event of failure is hard to judge, except to say that I trust it won't give me the chance to find out.
Tony
The link you gave suggests that loads of British TVs of the 50s and 60s were fitted with diode wattless dropper systems. Is this true? If so I wasn't aware of it. I personally only know of the Thorn sets mentioned in my earlier post.
I recall only once using a zener as a crowbar in conjunction with a 1.4V filament supply, part of a power supply for battery portables. That was fused of course, but the preceding regulator has never failed to this point in time, so just how safe the valves would be in the event of failure is hard to judge, except to say that I trust it won't give me the chance to find out.
Tony
