Hello. I’m currently using a 100 A PowerMax with no issues. The power supply
fans is noisy when it
does come on though.
Can’t you wire up an overload voltage circuit for it?
Fernando N2FQ/6
n2fq@sbcglobal.net
> On Jun 4, 2019, at 10:58 AM, P.C. Anderson <xtraham58@hotmail.com> wrote:
>
> FYI, I have been running my Herc ll Amp with an Astron RS 70A with out any
> issues. Does not drop any volts under full load. No noise. There are some out
> there at a good price.
>
> Andy...W3LI
>
> ________________________________
>
>
> Gary, My Hercules II blew one section of the 9420 or the supply in losing one
> section blew the control section of the amp. TT repaired the amp, but I
> didn't want to try to get the supply down there for repair.
>
> As a result, I bought an Ameritron 75 Amp switcher, and have used it for
> three or more years with no problems at all. It's the same as the MFJ Supply
> with a different tag on it.
> It puts out the 500 watts with no problem.I
>
> John, K4AVX
>
> Original MESSAGE:
> Date: Sun, 2 Jun 2019 04:50:27 -0400
> From: Gary Hendricks
> Subject: [TenTec] 9420 VS Switcher
>
>
> I have been looking at the schematic for my 9420 supply and it looks
> like the output of the series regulators have no over voltage
> protection. If my memory doesnt fail me I think when I was working at
> TenTec I remember hearing the service guys talk about pass transistor
> failures on this supply being somewhat common.
>
> Has anyone used one of the high current switching supplies on the
> Hercules II amp? I see some avail at 14 volts and 100 amps with every
> protection built in.
>
> Thinking about letting 9420 go and using one of the switchers because of
> the protection built in
>
> Thanks
>
> Gary K4MT
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