[HAM] Leslie 25 - Electrolytic goes PFFFT!!

[David Damroze]

On Apr 12, 2007, at 8:16 AM, OF wrote:

> At 11:46 PM 4/11/2007, David Damroze wrote:
>> The booster amp keeps blowing fuses. So , I replaced the power tubes 
>> and
>>   a bad diode.  Fuse still blew.
>>   I noticed a cap with an electrolyte leak - 45 mfd 450 V - replaced 
>> it.
>> ......white smoke
>> billows from the amp.
>
> There are two electrolytics in that amp, both are supposed to be 30 
> MFD.
> The power supply at that point is close to 450V so your cap was too 
> small
> voltage-wise.
  The one I took out was marked 45 MFD and 450 V.
  I put the new one in in the same direction. Maybe the previous had 
been a
replacement ?
> I hope you have the schematic and are able to understand it.
  Mostly . The polarities aren't marked.
> You should be using 500V caps to allow for surges and the over-voltage 
> that
> comes out of the wall in this area. (My house voltage is 138V).
>
> Did you put the cap in in the right direction in relation to ground?
  I put the new one in in the same direction as the one I removed.
>
>
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