bias adjustment plexi50

stratolounger
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bias adjustment plexi50

« on: January 13, 2010, 04:23:11 PM »

What kind of milliamps are you guys running in your plexi50? I was thinking of 25-30.


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cmoore
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Re: bias adjustment plexi50

« Reply #1 on: January 13, 2010, 07:05:59 PM »

30 milli amps would certainly be a common ground. But you need to consider two other factors:
1. Your Tone. How do you like the way your amp sounds and responds to your touch with a certain bias.
2. Milli amps by themselves are only half the equation. You need to check you plate voltage and make sure you are not running too much past 70%-80% dissipation. At some point there are diminishing returns regarding tone and tube life. Certainly if you are red plating your bias is too positive.
Good Luck


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stratolounger
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Re: bias adjustment plexi50

« Reply #2 on: January 13, 2010, 08:48:20 PM »

Thanks, hiredhand I found a couple of minor problems before I fired the amp up and now it seems to be idling quite nicely and seems very low noise. I've got to hand it to Nik, he does an excellent job with his kits and completed amps. I'll post my review once I break in all the capacitors/etc.


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stratolounger
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Re: bias adjustment plexi50

« Reply #3 on: January 21, 2010, 07:34:39 PM »

I set them at 32ma, sounds great!


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