On Thu, 19 Jan 2006 12:05:07 -0800 (PST), Dave Haupt wrote:
>The original Hercules I (model 444,
>ran on 50V, not 12), is no longer supported, due to RF
>transistor obsolescence. I have one on the bench
>right now, fortunately the RF devices are fine, and
>it's a power supply problem.
I've got one too. When I bought it (used), it was wired for
120V. I rewired it for 240v, and it didn't work -- blew fuses,
as I recall. What I found was that one of the Molexes was wired
wrong -- probably built on a Monday morning. Corrected that and
it ran fine -- except that:
As it warms up, the voltage to which the power supply regulates
drifts up and causes the protection circuit to engage, which
prevents it from transmitting. TenTec told me this was a known
problem, but that since they had to discontinue the amp (thanks
to Motorola discontinuing the output devices), they had not put
in the engineering time to fix the drift problem.
Mine is in good shape, but I need to fix the regulator drift
problem. If anyone knows how, I'd love to hear about it so that
I don't have to reinvent the wheel.
Jim K9YC
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