On Sun, 22 Mar 1998 15:40:32 GMT boyd@humboldt1.com (Old Ham) writes:
>Hi Roger,
> Check with MCM Electronics in Ohio. There phone
>number is 800-543-4300. They have 80 mf 450 volt
>for $3.94 each and 100 mf 450 volt for $5.20 and
>if you buy 10 the price drops 10 to 15 %.
>
> I ordered some for a National Amp and when I
>got them they looked a little small compared to what
>was in there but they had the same value so I put them
>in and they worked fine...
Hmmm. I had a disaster...years ago...when I tried cheap caps in one of my
NCL-2000's Boyd. I suggest that you keep a good eye on the capacitor
temperature...mine started boiling from the high ripple current...almost
lost the xfmr. A good cap will barely get warm to the touch after several
hours of standby in the SSB position. You should also check the voltage
drop across each cap....there should be a 5% maximum variation.
I just redid my 6M NCL-2000 and used the CDE 381LX since they snap right
into the holders.....also went to 100K equalizer resistors...the NCL PS
board really traps heat.
73 Carl KM1H ex-National Radio...on NCL design team
>
>Good Luck & 73,
>Boyd N6DMF
>
>
>On Sun, 22 Mar 1998 13:23:50 +0000, you wrote:
>
>>Looks like time to rebuild the old L-7 power supply. Where can one
>obtain high
>>voltage axial lead electrolytic caps these days?
>>
>>Thanks, Roger
>
>
>--
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>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
>Search: http://www.contesting.com/km9p/search.htm
>
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