[TenTec] power supplies

[Phil Sussman]

Typically switching power supplies are much cheaper to produce and
weigh less (due to the lack of that heavy transformer). Unfortunately,
the 'switchers' actually produce more noise (including harmonics), but
are easier to filter.

Older supplies (in my opinion) are less immune to fluctuations in input
with respect to surges and spikes. However, the older units tend to 
pull more current and are less efficient than their newer cousins. Also,
their regulation can be sluggish and prone to output transistor overload 
failures. 

>From the noise point of view, filtering older units is a lower frequency
problem whereas newer switchers have higher harmonic output. 

In reality; however, both should work without problems unless abused or
overloaded.

Good luck!

73 de Phil - N8PS

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Quoting Michael Goins <wmgoins at gmail.com>:

> I'm looking for a 35 amp supply for the Jupiters and leaning heavily
> toward old-time transformer supplies (probably an Astron). Bought one,
> but it turned up dead when it arrived, so looking for another until I
> have time to do the needed repairs  I know some of the TenTec supplies
> are switchers - but worried about noise as I have a really low noise
> floor here. Opinions, please?
> 
> Michael Goins, k5wmg
> Professor, Writing
> University of Texas at San Antonio