On Jul 15, 2006, at 3:28 AM, Gudguyham@aol.com wrote:
>
> In a message dated 7/15/2006 1:23:13 A.M. Eastern Standard Time,
> rob@sherweng.com writes:
>
> I was in commercial broadcasting for about 25 years, and filament
> life
> was an issue. What puzzles me, however, is Alpha's recommendation to
> turn off their amps if one is not going to use it for two hours.
> If I
> was going to be operating on and off during a Saturday, for
> example, my
> inclination would be to leave it on until I was finished operating for
> the day. Any idea why Alpha says what they do?
>
>
>
>
> I was also under the impression to leave the filaments running.
> One of the
> first things I did with the many SB-220's I owned was to add a
> stand-by
> switch so I would not have to shut down the filaments when I did a
> bare foot to KW
> comparison report on the air. I am sure someone could make an
> argument
> saying that cycling the filaments is not a problem,but it was
> always my belief
> that if a good step start was not incorporated in the filament
> supply that the
> constant cycling could eventually cut down on filament life.
`••••
Lou == The SB-220 uses a current-limiting type filament transformer
that allows no more than 60% of the 3-500Z's rated filament inrush
current to flow, so step-starting the filament is unnecessary.
However, the inrush current to the HV transformer is such that it
will eventually erode the contacts of the ON/OFF switch, so a step-
start is still useful.
end
15 July, 5:46AM
> it is a known
> fact that 99% of light bulbs that burn out, burn out when they are
> first turned
> on, a big bright light for a second, and puff dead bulb! 73 Lou
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
R L MEASURES, AG6K. 805-386-3734
r@somis.org
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|