24 Nov
2014
24 Nov
'14
7:46 p.m.
On 11/24/2014 02:28 PM, Johnny Billquist wrote:
I wasn't aware that the KL needs 3-phase, but it might
just be that the power supplies are large enough, and
complicated enough, that you can't just rewire them.
The KL10B had an immense 3-phase transformer, star rectifier
and capacitor
bank, which produced about 12 V DC. This was fed to a
massive linear regulator
on a huge round heat sink. Compuserve ran a LOT of KL10B's,
and designed their
own switching power supplies to save power and air
conditioning costs. They never
got DEC to pick up on that, so had to retrofit all the
machines as they came in.
Jon