Will M wrote:
Not necessarily, you may get by with replacing the one diode with the
1N5408. I think the 1N5406 is the 600 V, 3 amp. They should all have a
drop of about 0.7 volts a piece. I only found one data sheet for this
on the web and it was a pay site. It's a wonder they didn't all fail
from the domino effect. But, if you want to replace them all, get some
good solder wick and go at it. To find an original M4G5, you'd probably
to search about all the surplus houses. A Google search didn't find any
for sale anywhere. I still don't think it would cause too much of a
problem just replacing that one, if it's the only bad one in the
string. About the only way to tell for sure if they're good or not is
run a hi-pot test for leakage on each.
As Will implies, it's not good practice to replace part of a diode
string with one of a completely different kind. It is almost guaranteed
to cause unequal division of reverse voltages, and will be fighting
against any equalizing Rs and Cs that are provided on the board.
The hardest part of the whole job is removing the rectifier board so you
can work on it. You don't want to have to repeat that, so why not
replace all the rectifiers with 1N5408s (new, branded and supplied on a
bandolier). They are reliable, readily available and excellent value,
which makes them the industry standard for this type of application.
--
73 from Ian G3SEK 'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.co.uk/g3sek
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