> Why would the electrolytics in the AL-1500 require any
> special airflow since
> they are 105* C computer grade and meant to operate in a
> warm enviroment? You once claimed that those caps were a
> special order of the highest quality.
The fact they say "105C* has NOTHING to do with being safe
to run at 105 or even being "meant" to work at 105. 105C is
the absolute maximum temperature to fall within factory MTBF
specs.
Anyone working with electrolytics should be aware that the
single most damaging thing to electrolytic life is ambient
temperature. This is true for all electrolytics of that
general material. There is a large decrease in life as
temperature is increased. While voltage is a linear life
shortening progression, temperature is a cube law effect.
The air system in the AL-12 series amplifiers (82,1200,1500)
have 40-50 watts total of bleeder heat above the
electrolytics plus 35 watts of filament transformer heat
dissipation, and it is important to not let that heat
collect in that area.
73 Tom
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