I got some 4,7 uF caps for the cathode bypass today. I measured them, and they measure about 3,2 uF... Is that normal, or are the caps of bad quality? Or could it be my multimeter that is bad?
But then, maybe 4,7 is to little anyway, I see some of you use higher values and different values on different tubes...?
Tommy
Cap value, how acurate are they?
Moderators: pompeiisneaks, Colossal
Re: Cap value, how acurate are they?
Those probably have a 20% tolerance, so you're just under the 3.3uF lower limit.
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skyboltone
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Why guess?
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The Last of the World's Great Human Beings
Seek immediate medical attention if you suddenly go either deaf or blind.
If you put the Federal Government in charge of the Sahara Desert, in five years time there would be a shortage of sand.
Seek immediate medical attention if you suddenly go either deaf or blind.
If you put the Federal Government in charge of the Sahara Desert, in five years time there would be a shortage of sand.
Re: Cap value, how acurate are they?
(Capacitors must be non-polarized)
So it can't do electrolytics?
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skyboltone
- Posts: 2287
- Joined: Wed May 10, 2006 7:02 pm
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Re: Cap value, how acurate are they?
Yup, I use a Fluke 87 for those guys. But notice too that it's upper cutoff is 1 micro farad. That's for the little guys. My Fluke is hopelessly unreliable with smaller capacitance. It'll tell me if a 47 mfd is close or not.
If you're looking for a 220pf cap out of the parts bin, this is the only $100 tool in existence that will tell you that's what you got.
When making resonant tanks (something we don't do a lot of here on the Amp garage
)) there is no substitute.
This is a nice tool. No personal connection with AADE at all. YMMV
Dan
If you're looking for a 220pf cap out of the parts bin, this is the only $100 tool in existence that will tell you that's what you got.
When making resonant tanks (something we don't do a lot of here on the Amp garage
)) there is no substitute. This is a nice tool. No personal connection with AADE at all. YMMV
Dan
The Last of the World's Great Human Beings
Seek immediate medical attention if you suddenly go either deaf or blind.
If you put the Federal Government in charge of the Sahara Desert, in five years time there would be a shortage of sand.
Seek immediate medical attention if you suddenly go either deaf or blind.
If you put the Federal Government in charge of the Sahara Desert, in five years time there would be a shortage of sand.