Dave McGuire <mcguire at neurotica.com> wrote:
On Jun 18, 2009, at 5:30 AM, Johnny Billquist wrote:
>>> >>> > But I don't
lioke changing the classic machine. Not even
>> >>> replacing > PSUs
>>> >>> > with switchers. The original PSU is part of the design, and
I
>> >>> want to
>>> >>> > keep it that way.
> >> While I agree with you here, I have to admit that, if my
> >> PDP-11/70 had switching power supplies, I'd probably run it a lot
> >> more often. I'd *never* make it an irreversible modification,
> >> though.
>
> Um. An 11/70 have switched power supplies normally. Did you remove
> them and install large transformers? That would become a very heavy
> machine in that case. :-)
Nope, see my other message...it already has large transformers,
and it is definitely a very heavy machine! ;)
An 11/70 is a heavy machine, indeed. But if you were to have
transformers to supply all the power needed, you'd increase the weight
significantly...
I have removed the power supply for the memory of a KL10, and that is
really a linear supply. The weight, and power consumption of that is on
a totally different scale to anything switching...
Where have you seen any large transformers in an 11/70 by the way?
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt at softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol