On Sat, 3 Feb 2024 09:28:19 -0800 (PST), "
ohg...@gmail.com"
<
ohg...@gmail.com> wrote:
>On Friday, February 2, 2024 at 1:38:38?PM UTC-5, legg wrote:
>> On Fri, 2 Feb 2024 08:10:46 -0800 (PST), "
ohg...@gmail.com"
>> <
ohg...@gmail.com> wrote:
>> >On Friday, February 2, 2024 at 10:22:49?AM UTC-5, legg wrote:
>> >> On Thu, 1 Feb 2024 11:14:13 -0800 (PST), "
ohg...@gmail.com"
>> >> <
ohg...@gmail.com> wrote:
>> >>
>> >> >I'm going through some stuff I have to move (retiring in June) and trying to decide what to keep. I have a Burr Brown 501 dual supply that puts out +/-15 volts with 115 VAC in. The supply is working but I don't know what's its use was originally. It's a compact block and it's heavy, but there's no current rating listed and I haven't been able to find out anything about it. Is it supposed to supply a reference for calibrating meters or is it used as a power supply? Not being adjustable I wonder if it's made for something specific. Any insight appreciated.
>> >> It's just a supply aimed at permanent installation
>> >> in analog circuits.
>> >>
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>
>
>> I think you'll find it's both low drift and quiet, but
>> it's getting past it's due date w/r to low frequency
>> electrolytic filter caps . . . and even film caps.
>>
>
><<< Given that it's sealed, I figured it's all film caps (although I certainly am not sure), but good quality film caps have never had an expiration date in the ones I've run across the last 50 years or so.
>
If low frequency output ripple increases prior to internal
current limiting, then the bulk reservoir caps will need
replacement.
>
>> I suggested antique value after spotting one on ebay
>> for $$$.
>
>Yeah, I saw that LOL, but as I always said when comes to ebay - "askin' ain't the same as gettin'"
>
>It's small enough where it won't be a burden to store it for a while, so I'll not pitch it out yet.
I've been trying to get a mid-50s G-Limiting Computer into
a suitable museum for the last decade.
It's one of the earliest components used in fly-by-wire
avionics, employing plug-in vacuum tube op amps; the
sort of thing used in the Avro Arrow.
I get the impression that these organizations anticipate
that if they hold off acquisitions long enough, then all
the old crocks will die off and stop bothering them.
The 501 may have been used in analog computing in the 60s.
RL