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Title: johnson 500 transfomer impedance Post by: kc2hgc on February 24, 2012, 06:15:00 PM Hi Eveyone steve here,
I have a johnson 500 with out a mod trany :-\I need help. how do i figer the plate & transfomer resistance/impedance to work? we know the modulater 811 & final 4-400 tubes that the rig use`es But I dont know how to figer what the transfomer resistance I will need? Do I look the tubes up and match the DC ptate resistance to the trany resistance ? Please help Tnx Steve... Title: Re: johnson 500 transfomer impedance Post by: Detroit47 on February 24, 2012, 06:45:43 PM I have the specs for my Peter Dahl mod trany for my 500. This is what is on spec sheet.
PR) 23000 ohms P-P 2400 vct (200 - 3500 hz) s1) 8000 ohms (2000 vdc @250 ma) 1414 vac 250 watt $160.00 dollars in 1993 Title: Re: johnson 500 transfomer impedance Post by: kc2hgc on February 25, 2012, 09:02:29 AM Hi D 47 thank you for the reply . What I really want to know was how do they get 23000 ohms & 8000 ohms ? AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
I want to use the transfomers that I have here sitting on the shelf.. Thank`s again Steve ... |