You might try feeding each power supply through a large diode.
It would cause a slight loss in power, but might isolate the 4 power
supplies from each other.
73
Rick, DJ0IP
-----Original Message-----
From: TenTec [mailto:tentec-bounces@contesting.com] On Behalf Of Tom Macon
Sent: Sunday, March 03, 2013 6:19 PM
To: Ten-tec Forum
Subject: [TenTec] Herc II vs Astron
Hi, all -
I have replaced the four supplies in the 9420 beast with four Astron
SS-25's. At first all seemed well but then I experienced reduced power out
from the 420 Herc.
Upon investigation, it seems that one or more of the Astrons shuts down so
not all four sections of the amp are powered. I see that, if I turn off one
supply, that there is backfeed from the amp showing up on its output. My
guess is that the one of the supplies (a little slower to come up?) senses
the backfeed voltage from another one and this triggers some protection
feature.
I have only the sheet that came with the Astrons - no schematic or detailed
technical info. Tomorrow I will call them to see if they can shed any
light, meanwhile perhaps someone here has experience or insight?
73,
Tom Macon, K9BTQ
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