Another factor for doubters to consider.? Materials,
manufacturing and underlying technology in general have made it
easier to build better caps than 50 years ago.? I'm not saying
that some of the cost-is-our-only-focus overseas makers are not
building lousy caps - and there is the problem with "fake" caps
(hence the prohibition of ebay as a source).? But if you are
picking something out of a Mouser or Digikey catalog, for sure
it's going to have better performance than just about anything
that was built 50 years ago.
73/jeff/ac0c
alpha-charlie-zero-charlie
On 4/5/2024 10:02 AM, Jim Whartenby via
groups.io wrote:
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Show quoted text
Agreed Jeff, this is also
my understanding.??
I'm confident that at
hallicrafters, unit price was at least equal to performance
if not the primary goal.? Government contracts required high
reliability, not consumer products so components were chosen
accordingly.? It was a cutthroat? business, a penny saved
was a penny earned.
Regards,
Jim
Logic: Method used to
arrive at the wrong conclusion, with confidence.?
Murphy
Unless you are working on a SPS, the ESR of a new cap
from a reliable source (that means Digikey, etc, and
not ebay), as it applies to use in a old tube rig,
will be absolutely satisfactory.? And the temp range,
again in the tube rig context, is more about other
components heating up the cap, rather than their
internally generated heating as a result of the
ongoing reformation process and the associated
leakage.
73/jeff/ac0c
alpha-charlie-zero-charlie
On
4/5/2024 7:52 AM, Dave Jordan wrote:
Hi,
I have been taught that the lowest ESR is the
best value. Never questioned that guidance.? I
suppose you could call Hayseed and ask them about
the ESR value of their caps.
DIgiKey?sells an inexpensive
For an in-depth discussion about ESR measurements
try this link to.
73
dave
On Fri,
Apr 5, 2024 at 2:12?AM Jim Whartenby via
<old_radio=
[email protected]>
wrote:
How does one know if the ESR is
the "best value" when the actual filter
capacitor ESR is not specified by either
Hayseed, hallicrafters or any of the
original capacitor suppliers?? I can see the
need for low ESR capacitors in some power
supply applications where the capacitor is
completely discharged in one cycle like the
capacitors found in parallel gap welders,
for example.? ?
Just how hot are these filter
capacitors getting above ambient temperature
from internal heating, during normal
operation?
Regards,
Jim
Logic:
Method used to arrive at the wrong
conclusion, with confidence.? Murphy
On Thursday, April 4, 2024 at 09:32:51
PM CDT, Dave Jordan <
wa3gin@...>
wrote:
Nice looking
craftsmanship.??
Here is a ham owned cap company
that has been around for a long time
and produces some of the best cap
kits for our hobby.? ?t
As well some of the best ESR
values for electrolytics?used in our
boat anchor power supplies. For
those of you not familiar with the
term ESR. Here is
a brief definition:
Equivalent
series resistance?(ESR),
also known as internal resistance,
is a value representing the loss
of useful energy in a simple
electronic circuit consisting of a
resistor and an ideal (perfect)
capacitor. Technically speaking,
the energy is not lost but is
usually dissipated as undesirable
heat. For those curious about this
spec there is plenty of good
reading on the?internet.?
73
Dave
Looks a nice job.
I printed these in abs for my
ps2000 .
They use the capacitors
suggested by Walt in his repair
manual.?
Ian
On Thu, Apr 4,
2024, 9:13 PM W7WRX <
clark@...>
wrote:
This
looks all new and aftermarket.?
Wondering who did it.? Both my
PS2000 have these.
C
