replacement transformer wanted for IMSAI power supply

From: Dave Dameron <ddameron_at_earthlink.net>
Date: Sun May 9 19:55:43 1999

At 12:32 AM 5/10/99 +0100, Tony wrote:
>>
>>Eric wrote:
>> 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.
>
>Pull out all the boards and disconnect the rectifiers from the
>secondaries. Does the transformer still get hot? A shorted diode or
>smoothing capacitor will make the transformer overheat...
>
>Assuming it still gets hot, it sounds like you have shorted turns :-(
>
>>
>> Is there any suitable replacement that is still manufactured? Or, failing
>> that, does anyone have a spare for sale?
>
>What are the ratings? Could you replace it with 2 transformers (one for
>the 16V rails, one for the 8V)? Can you rewind the old one (it's not that
>hard to do)?
>
>It's probably easier to rewind the transformer than replace it with
>SMPSUs.
>
Yes.
What are the dimensions of the core? The longest dimension (length
usually), and the thickness. The height should be 5/6 of the length.
Hopefully the laminations are not welded together like microwave oven
transformers. If the voltages checked out without a load, look for a very
good short somewhere.
The 5 Amp line fuse didn't blow?

-Dave
Received on Sun May 09 1999 - 19:55:43 BST