Hey all,
Im working on a mxl to m221b mod right now. I will be using the 3u capsule and I don't think they can handle the 120v polarization that the original circuit calls for...
Stock schematic (with 10uf filter cap added):
I had a few questions about how to implement a divider circuit and also a few questions about component functions.
First, in the stock circuit, what is the purpose of the R6-500k resistor that connects anode to to ground?
Next, I was thinking of adding one resistor pre R4 to create a voltage divider with the 100k+500k resistors as the shunt leg of the divider. So to give 60v at capsule, i would add a 600k resistor on the b+ input line... but that would mess up the plate resistor value (seeing 600k before b+) and the plate would see a lot less voltage than it needs so thats probably wrong...
So, what about a 50k/50k divider like this so the plate still sees 100k between itself and b+ but the capsule will get a B+/2 voltage level...
Would that work or would I also want to drop the 500k to a 450k to retain some sort of balance?
Any reflections would be helpful for my process here. Thanks so much!
Im working on a mxl to m221b mod right now. I will be using the 3u capsule and I don't think they can handle the 120v polarization that the original circuit calls for...
Stock schematic (with 10uf filter cap added):
I had a few questions about how to implement a divider circuit and also a few questions about component functions.
First, in the stock circuit, what is the purpose of the R6-500k resistor that connects anode to to ground?
Next, I was thinking of adding one resistor pre R4 to create a voltage divider with the 100k+500k resistors as the shunt leg of the divider. So to give 60v at capsule, i would add a 600k resistor on the b+ input line... but that would mess up the plate resistor value (seeing 600k before b+) and the plate would see a lot less voltage than it needs so thats probably wrong...
So, what about a 50k/50k divider like this so the plate still sees 100k between itself and b+ but the capsule will get a B+/2 voltage level...
Would that work or would I also want to drop the 500k to a 450k to retain some sort of balance?
Any reflections would be helpful for my process here. Thanks so much!