I've built an amp that is pretty high voltage to try to get a lot of power so the PS has to branch off in some ways to deal with the high voltage. I do not use a choke and instead use a 1K 20W screen dropping resistor for the screen supply. Building the same amp but with more regular PS voltages allows me to arrange the PS in a more normal way, and truly, the amp sounds a bit better. It is more tight and responsive which I guess makes sense since the screen supply sags less. But also I think part of the thing is that the preamp sags less as well because it's not drawn directly off the B+. I haven't actually tested this by measuring voltages yet but it makes me wonder if I could add a choke to my HV PS for the preamp only and somewhat mimic the better result of the lower voltage PS.
1. If I added a choke after the 18K resistor is there any particular value that would be good? I know they say higher inductance is better filtering but everyone seems to alwasy be talking about chokes for screen and preamp, this would be preamp only. I figure low DC resistance and 500V rating would be good, but maybe inductance value doesn't matter much?
2. If I added a choke after 18K resistor should I add a power supply node between choke and 18K resistor?
3. any other thoughts on if this is would be an improvement? I am trying it anyway because I have a hammond 193H laying around. This would not be an ideal choke for this application because it's a big monster of a choke (5H, 600VDC, 200mA, physically large), but i figure if I clip it in and out of series with an alligator clip I can at least preview the effect.
Thanks for any comments
1. If I added a choke after the 18K resistor is there any particular value that would be good? I know they say higher inductance is better filtering but everyone seems to alwasy be talking about chokes for screen and preamp, this would be preamp only. I figure low DC resistance and 500V rating would be good, but maybe inductance value doesn't matter much?
2. If I added a choke after 18K resistor should I add a power supply node between choke and 18K resistor?
3. any other thoughts on if this is would be an improvement? I am trying it anyway because I have a hammond 193H laying around. This would not be an ideal choke for this application because it's a big monster of a choke (5H, 600VDC, 200mA, physically large), but i figure if I clip it in and out of series with an alligator clip I can at least preview the effect.
Thanks for any comments
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