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PJL · 20th Dec 2009, 9:21 pm

The 50uF is the wrong way around. As the cathode bias appears to be shared by the 75 I am not sure it will work without the 50uF. This seems a very odd arrangement and I wonder if there is something else wrong with the wiring. Did you take any pictures before you started?

You ran the 42 flat out when the 510K was connected to anode of the 75.

20th Dec 2009, 9:21 pm	#89
PJL Dekatron Join Date: Sep 2005 Location: Seaford, East Sussex, UK. Posts: 5,997	Re: Newb Stumped on a Derwent The 50uF is the wrong way around. As the cathode bias appears to be shared by the 75 I am not sure it will work without the 50uF. This seems a very odd arrangement and I wonder if there is something else wrong with the wiring. Did you take any pictures before you started? You ran the 42 flat out when the 510K was connected to anode of the 75.