Quote:
Originally Posted by Doug
one guy that was a member on arf has
My friend John Folsom says, 'It's all about the spares.'"
-Bob the Antique TV Guy in 2021
so
good luck
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Yes, it is all about spares. But as time marches, it it all about creativity and much of the time making spares!
I was looking at the high voltage MOSFET option to replace the transformer. It is a way lot cheaper (parts under $10) and maybe more efficient and less prone to breakdown.
Looking at the FETs these days, they have a very large transconductance so with such a light load, the gain should be achieveable with a single moderate power MOSFET.
I have thrown in some values for a generic MOSFET to achieve the bias voltages and quieesent point of around 225 vdc to allow for a wide swing. I anticipate average vertical convergence level will only be in the region of 50 to 100 volts p-p to the convergence plate. But that is just a guess.
Find updated my circuit with some component values. In the drawing where my circuit is inserted into the CT-100 circuit, I left a gate resistor with no value to provide the option to reduce gain.