Amazingly
(given my normal caution) I would fit the fuses, power up and
see
what happens.
Indeed, this does surprise me! :-)
There are several reasons why I don;t think you need to be over-cautious
this time.
The first is that although fuses blew, there was a definite reason for
them to blow, you applied too high an input voltage, so probably the
mains transformer core would ahve saturated, the current would have gone
sky-high.
The socnnd, and more importent, reason is to consider what could be
damaged if things went wrong. In the case of an IC-based computer, a
failure int he PSU can wipe out all the ICs -- expensive and torublesoem
to fix (fi there are rare/custom ones invovled). So I would always check
the PS on a dummy load first.
But in the case of the Mdoel 33 Teletype, what can happen if that
transistor has failed? If it's open, there's no current in the receiver
magnet, the machine 'runs open'. OK, it's probsbly not good to run it
continuously like that, but it wil ldo no harm for the few minutes it
takes for you to nice that it's running like that. If the transistor is
shorted, well, since the normal state of that transistor is saturated,
there will just be the normal current through the receiver magnet, the
machine will never do anything. Bu no damage.
I suppose it's posisble for a failure here to damage otehr parts in the
selector magnet driver, but those parts are cheap and esasy to get -- R's
C's and a transistor. And I think such damage is unlilely anyway.
So yes, try it and see what happens.
-tony
