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In Reply to: RE: need some advice ... posted by Caucasian Blackplate on July 31, 2017 at 16:51:48
Not quite sure I follow you on that. I like to use as few parts as possible, so I would like to understand what your reasoning if you care to explain. Thanks.
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The second stage needs to see +75V at its grid, and Broskie has added in the two 1M resistors and coupling cap to provide this.
If you adjust the operating point of the first stage you can change the voltage at the plate from 150 to 75, then this plate can be connected to the grid of the next stage (leaving the 300 Ohm resistor to prevent oscillations).
To make this change, you'd want to draw some load lines. I'd recommend looking at 47K and 75K.
Thanks, I will give it a try and a listen.
Try a 75K plate load and a 530 Ohm cathode resistor. That should give you about 2V of bias and 75V on the plate.
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