> Henry amps of the 2 x 8874 vintage had a variety of problems on 50Hz.
> First was core saturation because the transformer was too small; second,
> the tuning cap for the smoothing choke was designed for 120Hz ripple,
> and therefore was wrong for 100Hz; and third, the blower was much too
> small at the reduced running speed. These three design faults led to a
> very hot little box.
>
> These were all quite old models; I don't know about the later and
> current Henry amps.
I suspect that the problem lives on, Ian. Most Henry models have tuned
chokes in the power supply. Henry does offer many voltages and choice
of 50-60 hz for most models, so drop-in replacement parts are available.
(((73)))
Phil, K5PC
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