capacitor advise

Overd0se · 9th July 2004, 05:51 AM

At a local surplus auction I purchased a palat of some sort of power supplies. I think they were for a co2 laser or something. I mainly got them for the rack mount cases, but there are a lot of capacitors inside and I was wondering if they have any potential for an audio application. They are Bosch capacitors, 40uF 2.5kV. Any ideas will be appreciated.

dhaen · 9th July 2004, 06:50 AM

These could be used in power supplies for some of the more exotic transmitting triode / tetrodes

Often us valve (tube) types have to use stacked electrolytics to achieve this kind of voltage rating. Such projects are often expensive and can be dangerous in all but the most experienced hands.

I you can't use them yourself, i'm sure you'll get a good response at the "Trading Post".

Overd0se · 11th July 2004, 11:57 PM

Do capacitors have any sort of "shelf life", one of the decals on the inside of the case says it was made in 1985. Also, if I were to sell/trade them, what do you think they are worth?

Apex Jr · 12th July 2004, 02:19 AM

Capacitors do have a shelf life and yours look like there
almost 20 years old, I know most caps can be formed and
most likely brought back to life, using a variac , for DIY they might be fine,
However these are High voltage and need to be double
careful also because there high voltage might be worth
a fair amount of money. What would I sell them for, I'd
need to see a picture and know a little more. Are they
poly type, for motor start, Can with PCB's (also a big
problem) Steve @ Apex Jr.

Overd0se · 12th July 2004, 01:52 PM

Here is a pic of the caps. Approximate dimensions are 4" diameter and 6.5" height. I had to significantly lower the res to attach it, so if you would like better pics I can email them.

Apex Jr · 12th July 2004, 02:53 PM

Can type, Here's my take...
If they do not say NO PCB's I personally couldn't sell
them since I'm a bonifide business at least in Calif.
As a person to the DIY market I don't know. If so
I would get $5.00 to $7.50ea. If they do say No PCB's
There worth $12.50 to $15.00............
Steve @ Apex Jr.

9th July 2004, 05:51 AM	#1
Overd0se diyAudio Member Join Date: Jul 2003 Location: .	capacitor advise At a local surplus auction I purchased a palat of some sort of power supplies. I think they were for a co2 laser or something. I mainly got them for the rack mount cases, but there are a lot of capacitors inside and I was wondering if they have any potential for an audio application. They are Bosch capacitors, 40uF 2.5kV. Any ideas will be appreciated.

9th July 2004, 06:50 AM	#2
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	These have great potential These could be used in power supplies for some of the more exotic transmitting triode / tetrodes Often us valve (tube) types have to use stacked electrolytics to achieve this kind of voltage rating. Such projects are often expensive and can be dangerous in all but the most experienced hands. I you can't use them yourself, i'm sure you'll get a good response at the "Trading Post".

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11th July 2004, 11:57 PM	#3
Overd0se diyAudio Member Join Date: Jul 2003 Location: .	Do capacitors have any sort of "shelf life", one of the decals on the inside of the case says it was made in 1985. Also, if I were to sell/trade them, what do you think they are worth?

12th July 2004, 02:19 AM	#4
Apex Jr diyAudio Member Join Date: Jun 2002 Location: Torrance, Calif	Capacitors do have a shelf life and yours look like there almost 20 years old, I know most caps can be formed and most likely brought back to life, using a variac , for DIY they might be fine, However these are High voltage and need to be double careful also because there high voltage might be worth a fair amount of money. What would I sell them for, I'd need to see a picture and know a little more. Are they poly type, for motor start, Can with PCB's (also a big problem) Steve @ Apex Jr.

12th July 2004, 02:53 PM	#6
Apex Jr diyAudio Member Join Date: Jun 2002 Location: Torrance, Calif	Can type, Here's my take... If they do not say NO PCB's I personally couldn't sell them since I'm a bonifide business at least in Calif. As a person to the DIY market I don't know. If so I would get $5.00 to $7.50ea. If they do say No PCB's There worth $12.50 to $15.00............ Steve @ Apex Jr.

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