[AMPS] MLA-2500 Help

[Kenneth D. Grimm]

Jon Ogden wrote:

<some good stuff snipped>

> I suspect the transformer.  The DC output of the supply is directly
> related to the input.  Caps help to filter out the ripple due to the
> rectification and so may raise your RMS voltage a bit closer to the peak
> DC voltage, but I don't think that it's a whole kilovolt as you are
> seeing.
> >
> >Thanks in advance. Before I start spending money on new filter bank
> >would appreciate your input.
> 
> My gut tells me it's not your filter bank.  Perhaps one of the "new"
> diodes you put in went bad, but perhaps your transformer is just not
> properly working.  I really suspect the transformer.  Also, is your input
> voltage really 230 Volts?  You might want to check that.
> If you have some form of HV probe and IF you are careful, measure the
> output voltage from the transformer.  Or, to be safer, you could put a
> variac on the input of the transformer and measure the output with a low
> input voltage.  It looks like it's approximately a 10:1 transformer
> ratio.  So set your variac to 10 volts on the input and you should get
> around 100 Volts on the output.  That's a little safer than measuring
> 2600.
> 

Jon has given good advice.  The only other thing that occurs to me is
the possibility that you lost a fuse in one leg of your 220.  However,
I'm sure anyone but me would have already checked that out.

Good luck and let us know what you discover.

73,

-- 
Ken K4XL
grimm@lynchburg.net
Boatanchor Manual Archive - ftp://bama.sbc.edu or
ftp://198.28.36.115/pub

--
FAQ on WWW:               http://www.contesting.com/ampfaq.html
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com
Search:                   http://www.contesting.com/km9p/search.htm