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Old 25th October 2010, 04:01 PM   #1
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Default Help me to make tube amply

Dear everybody,

I have a pair of capacitor:

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So I want to DIY amply with :
Input Power : 110v
Power : 65 watts x 2 in ultra-linear mode 30watts x 2 for triode mode
Output Tube : Power Tube adopts Shuguang KT88x 4
Input/Driver Tube : 12AT7 x 2, 12AU7 x 2
Ohms : 4 ohms and 8 ohms
I wanted to know this capacitor suit for this amply or not
Thank for your advise
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Old 25th October 2010, 04:38 PM   #2
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No - This is an RF high voltage cap .1 Ufd. When I say high voltage, I mean 10-15 KV. They sure are pretty, but not for audio.
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Old 25th October 2010, 04:49 PM   #3
kevinkr is offline kevinkr  United States
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I'm not sure there is any reason you couldn't use them if you wanted to - mounting would be the biggest concern. They could be very interesting, but would seem better suited to an SE amp with 0 fdbk where they would be audible.

100nF is big enough to be quite useful and there is no better dielectric IMHO than a vacuum. Could be very good.

I'm actually intrigued - where did you get these, and if you don't mind my asking - were they expensive?
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Old 25th October 2010, 05:24 PM   #4
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Surplus sales of nebraska Vacuum Fixed Capacitors - Page 2 has some, but they are a lot lower value than the one hienphs has. Google "vacuum fixed capacitors".
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Old 25th October 2010, 06:20 PM   #5
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Quote:
Originally Posted by hienphs View Post
I wanted to know this capacitor suit for this amply or not

Thank for your advise
Definitely not. What you have there are capacitors for an RF amp. The capacitances are going to be way too small for any audio frequency application. If you're not going to do an RF project, you can e-bay them to help fund an audio project.
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Old 25th October 2010, 06:24 PM   #6
kevinkr is offline kevinkr  United States
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Quote:
Originally Posted by Miles Prower View Post
Definitely not. What you have there are capacitors for an RF amp. The capacitances are going to be way too small for any audio frequency application. If you're not going to do an RF project, you can e-bay them to help fund an audio project.
I guess these might actually be 100pF capacitors and not 100nF caps as some have supposed - in which case they are not suitable as Miles has indicated.
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Old 25th October 2010, 06:29 PM   #7
davorin is offline davorin  Croatia
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Quote:
Originally Posted by firechief View Post
No - This is an RF high voltage cap .1 Ufd. When I say high voltage, I mean 10-15 KV. They sure are pretty, but not for audio.
This is 100 picoF, not 100nF(o.1 uF) capacitor!
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Old 25th October 2010, 06:43 PM   #8
kruesi is offline kruesi  United States
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100 pf seems more reasonable based on the picture- and they are indeed more suitable for RF (usually transmitting) than for an audio project. Sell them on eBay and use the profit to buy tubes (or audio-grade capacitors). Someone building a medium-powered transmitter or RF amplifier would be glad to have them!

They sure are beautiful, in any case.
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Old 25th October 2010, 07:14 PM   #9
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This is a vacuum capacitor and its value is 100pF (cyrillic ПФ = PF) but beware, the tolerance is pretty large at 10%.

There is no reason it cannot be used in an amplifier if 100pF is needed somewhere. After all, a vacuum capacitor has the most perfect dielectric known to man But the problem is, 100pF is not a common value for audio applications.

Thus I agree it could be put to better use if it would pass to somebody who is into transmitters, like a radio amateur. With the money you can make, you could buy better output transformers. That would make more of a difference sound-wise.

Kenneth
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Old 26th October 2010, 03:14 AM   #10
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Dear all,
Thank for your advise. It cannot use for tube amply.
I took it from rada component
Your any Idea for this capacitor
Best regards,
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