Bill, I once used one for about a year. I never got any reports of a
bad CW note nor did I detect any problem when I personally monitored the
signal.
73, Joe
Bill Fuqua wrote:
> To my surprise I found that the filaments of the HA-14 were not driven
>by a center-tapped AC filament transformer when using the AC power supply.
>I can see that this can be a real source of 60 Hz modulation on a
>signal. Has anyone used these for CW using the AC power supply?
>
>73
>Bill wa4lav
>
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