9 May
1999
9 May
'99
11:17 a.m.
The transformer in my IMSAI's power supply is not long for this world.
Yesterday I discovered that even with only the CPU card, one memory card,
and the front panel installed, the transformer got *very* hot in just a few
minutes, and started emitting unpleasant smells.
Is there any suitable replacement that is still manufactured? Or, failing
that, does anyone have a spare for sale?
If all else fails, I suppose I could install some VICOR switching power supply
modules. It looks like a VI-HAM input module would be required, along with a
pair of VI-263-EU modules to provide +/-18V at 8.3A, and a VI-26M-EU with a
VI-B6M-EU to provide +8V at 40A. This would have the advantage of autoranging
power-factor-corrected input, reduced heat dissipation, and the front panel
switch could be used as a low-voltage control to the switchers rather than
having live AC present. On the down side, it wouldn't be particularly
historic, and it would be extremely expensive.