> The SB1000 had about 50 times the switch failures (as determined
> by parts shipped to customers) of the nearly identical AL80A.
>
> The reasons were:
>
> 1.) A looser spec on the transformer no-load to full-load voltage
> change.
>
> 2.) No buck-boost winding to adjust power line voltage.
>
> 3.) No anti-corona washer at an area in the switch where voltage
> gradient is a problem.
Not true in all cases. The last SB-1000 I built had specific instructions
in the manual on installing the washer. The band switch crispy-crittered
anyway.
>
> 4.) No control over assembly and wiring, including relay contact
> adjustments.
5.) Improper component selection in the padder caps.
(this one added by K5PC)
(((73)))
Phil, K5PC
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