Re: [TenTec] TEN TEC 960 Power Supply Capacitor

[Curt Gamble <W0ALC@MINDSPRING.COM>]

I built a home brew amp,  pair of 3-500A's 40 years ago and after about 
25 years the computer grade
Caps became power resistors and took out some diodes.  Sad story was I 
paid $2.32 each 40 years ago
and the new ones cost ~ $23.00 each so hope they last a long time.  
SMILE.  Happy owner of two Orion II's.
73,  Curt WØALC  (Western CO)


On 6/17/2016 2:37 PM, Reeve Family wrote:
> As advised, I replaced the overheating filter capacitor in my TEN TEC 960
> power supply along with all of the 4 other electrolytics on the main circuit
> board and now the power supply is like new.no more overheating or burning
> smell. On removal, I discovered that the filter capacitor was starting to
> leak around the ground side mounting bolt which was partially fused around
> the threads making it somewhat difficult to get out.
>
>   
>
> I replaced the original 47,000 uF, 40V filter capacitor with a 50,000 uF, 75
> V unit that was exactly the same dimensions as the original (2-1/2" dia.  X
> 4-1/8" tall, and 1-1/8" pin spacing). As it turns out the PCB pads are
> plenty large with sufficient room around the capacitor on the TT-960, that
> you could probably drill a new hole if needed to accommodate a different
> size capacitor. Also good news, I only needed to partially disassemble the
> power supply in order to gain sufficient access to the underside of the main
> circuit board to allow removal of the filter capacitor mounting bolts. This
> did not require having to unsolder and of the heavy transformer leads or
> components other than the capacitors. The only other thing I needed in
> addition to the capacitors was a small tube of heat sink thermal paste for
> the large 4-terminal rectifier that is bolted to the chassis.
>
>   
>
> I had to order filter capacitor through eBay as many suppliers in the U.S.
> would not ship directly to Canada. The shipment arrived in 4 days from
> Hauppauge NY which I thought amazing.
>
>   
>
> With the main PCB only partially removed I was able to access and replace
> all of the electrolytic capacitors while I was at it, even though the other
> caps on the board appeared to be OK.
>
>   
>
> Original capacitors on the main board were as follows;
>
>   
>
> 47,000 uF, 40V  Large Can Filter Capacitor   (1)
>
>   
>
> 4700 uF, 35V  (1)
>
>   
>
> 220 uF, 16V  (1)
>
>   
>
> 33 uF, 35V  (1)
>
>   
>
> 4.7 uF, 50V  (1)
>
>   
>
> Overall the repair was relatively easy, and I am pleased with the results.
>
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>
> 73,
>
>   
>
> Rick VE3ORY
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