Posted by arnoldc (A ) on August 18, 2003 at 18:29:10

Hi, I would like to seek advice if what i have came up with is correct.

Sorry for the poor photo above of the diagram but I hope it would help. Based on some formulas i've gathered, I came up with:

My operating point for the 5842 driver stage is as follows -

Plate voltage of 98.5V current of 20mA and bias of 1.5V

Rk = 75 ohm (1.5V / 20mA)

Bypass cap is 470uF from C = 159 / (5 * 0.075) = ~ 424uF

My operating point for the 45 is as follows -

Plate voltage of 275V at 36mA

I calculated Rk of 4,166 ohms which will give me a cathode to ground of 150V

My B+ is 150V + 275 (plate to cathode) = 425

Grid voltage is -50, so 150V - 50V (grid to cathode) = 100V which is provided by the voltage divider made up of 220K and 68K resistors.

Am i on the right track or I completely lost it?

Appreciate any help. Thanks!

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