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Author Topic: TS830S - Need Repair Guidance  (Read 1568 times)
W9MAS
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Posts: 25




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« on: May 19, 2012, 02:09:41 AM »

Hi All

The HV filter caps in my 830S took a dive. They are starting to ooze. Was wondering if a pair of Cornell Dubilier 380LX General Purpose series would be a satisfactory replacement. They are rated at 990mA ripple current and sell for about $7 ea. from Digi-Key.

I hope that this will resolve the problem I'm having - Can't get anymore than about 25W output key-down on any band, although I measured about 725V on the plates. That was just before I noticed the vents starting to burst.

Thanks,
Mike, W9MAS Extra Class, FCC GROL

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K5LXP
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« Reply #1 on: May 19, 2012, 06:05:21 AM »

Electrolytics have gotten better since the 830 was made, so you should be able to find as good or better in the same form factor.

What I would do is see if the OEM cap spec's could be determined, then pick your replacement from there.  Surprisingly I've found some OEM product lines still in production after 20 years and exact replacements can be sourced.


Mark K5LXP
Albuquerque, NM
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KA4POL
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Posts: 2409




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« Reply #2 on: May 19, 2012, 06:06:05 AM »

See: http://www.eham.net/ehamforum/smf/index.php?topic=77771.0
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TANAKASAN
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Posts: 933




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« Reply #3 on: May 19, 2012, 11:30:39 AM »

When doing repairs like this I always follow three guidelines:

1) Find a replacement the right value, if this is not available then pick the next highest value.

2) Look at the voltage rating of the old caps, either match this or, preferably use a higher voltage rating.

3) Fit a high temperature cap that fits (1) and (2). I've seen capacitors rated to 120C that are meant for switched mode power supplies.

Tanakasan
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W9GB
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Posts: 3148




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« Reply #4 on: May 19, 2012, 04:42:57 PM »

Quote
Would a pair of Cornell Dubilier (CDE) 380LX General Purpose series (Snap-In mount) be a satisfactory replacement for my TS-830S HV power supply?
They are rated at 990mA ripple current and sell for about $7 ea. from Digi-Key

Mike -

I never cut costs for the HV capacitors for a HF amplifier OR a hybrid transceiver (uses tube finals).
CDE Aluminum Electrolytic Capacitor - Full Catalog of models and specs
http://www.cde.com/catalog/alum/

Ken, K4EAA provides very good replacement instructions with PHOTOS
http://k4eaa.com/hv-150b.html

Did the TS-830 use 120uf 500 WVDC values for their HV capacitors?

FIRST, match capacitor DIAMETER size -- and at least the same Value, and Voltage Rating.

The CDE 380L/LX is one of their more popular Snap-In electrolytic capacitors series with the widest selection (45 case sizes).
The series is has a load life of 3,000 hours and Max Temp of 85 degrees C

IF Kenwood used 450 WVDC, then you could look at CDE 381L/LX, which has same load life (3,000 hours) and Max Temp of 105 degrees C.
That can provide a longer load life than the 380L/LX
« Last Edit: May 19, 2012, 04:45:46 PM by W9GB » Logged
KE4DRN
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Posts: 3746




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« Reply #5 on: May 25, 2012, 04:04:42 PM »

hi

CDE part 380LX121M500A022  or Mouser part 598-80LX121M500A022

35mm dia. fits existing clamps. 500v 120uf

k4eaa sells them and you can also find them on ebay kenwood hv caps

73 james
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