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One further thought, Jeff: a great many amps today use a voltage doubler =
circuit for high voltage supply, but this requires at least two =
rectifiers, and one of the secondary transformer leads would go to the =
center of the capacitor bank, to complete the ckt.and today most amps =
have a "floating " b- , for use in grounded grid ckts.and metering. 73=20
carl / kz5ca
----- Original Message -----=20
From: K7xq@aol.com=20
To: amps@contesting.com=20
Sent: Thursday, August 30, 2001 3:26 AM
Subject: [AMPS] Need help with HV Power Supply for 3CX800A7
=20
I a wondering if someone can help me rebuild a HV Power Supply =
for a=20
3CX800A7. I received a used amplifier and power supply from someone =
and found=20
that the filter bank needed to be replaced. I removed all the =
capacitors and=20
replaced them. The problem is that I forgot to write down how they =
were=20
connected before I disassembled them. The problem is how the =
transformer and=20
rectifier are connected to the capacitor bank. The rectifier is some =
kind of=20
part made by VARO P/N# VC60X. When looking how it might have been =
connected=20
before, it looks like it wasn't configured for a full wave rectifier =
rather=20
it looks like some special kind of half wave rectifier with one of the =
outputs of the HV transformer going directly to either the output HV =
or to=20
ground. All of the schematics I can find always show each side of the=20
transformer must "see" a rectifier before it goes to the filter bank =
or a=20
output.=20
Unfortunately, I cannot get a schematic of how this power supply was =
build=20
before. Can anyone help me with this strange problem ??=20
Jeff K7XQ=20
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<DIV><FONT face=3DArial size=3D2>One further thought, Jeff: a great many =
amps today=20
use a voltage doubler circuit for high voltage supply, but this requires =
at=20
least two rectifiers, and one of the secondary transformer leads would =
go to the=20
center of the capacitor bank, to complete the ckt.and today most amps =
have a=20
"floating " b- , for use in grounded grid ckts.and metering. 73 =
</FONT></DIV>
<DIV><FONT face=3DArial size=3D2> carl / kz5ca</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A href=3D"mailto:K7xq@aol.com"; title=3DK7xq@aol.com>K7xq@aol.com</A> =
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
href=3D"mailto:amps@contesting.com"=20
title=3Damps@contesting.com>amps@contesting.com</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Thursday, August 30, 2001 =
3:26=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [AMPS] Need help with =
HV Power=20
Supply for 3CX800A7</DIV>
<DIV><BR></DIV><FONT face=3Darial,helvetica><FONT=20
size=3D2> =20
<BR> I a wondering if someone can =
help me=20
rebuild a HV Power Supply for a <BR>3CX800A7. I received a used =
amplifier and=20
power supply from someone and found <BR>that the filter bank needed to =
be=20
replaced. I removed all the capacitors and <BR>replaced them. The =
problem is=20
that I forgot to write down how they were <BR>connected before I =
disassembled them. The problem is how the transformer and =
<BR>rectifier are=20
connected to the capacitor bank. The rectifier is some kind of =
<BR>part made=20
by VARO P/N# VC60X. When looking how it might have been connected =
<BR>before,=20
it looks like it wasn't configured for a full wave rectifier rather =
<BR>it=20
looks like some special kind of half wave rectifier with one of the=20
<BR>outputs of the HV transformer going directly to either the output =
HV or to=20
<BR>ground. All of the schematics I can find always show each side of =
the=20
<BR>transformer must "see" a rectifier before it goes to the filter =
bank or a=20
<BR>output. <BR><BR>Unfortunately, I cannot get a schematic of how =
this power=20
supply was build <BR>before. Can anyone help me with this strange =
problem ??=20
<BR><BR>Jeff K7XQ <BR><BR></BLOCKQUOTE></FONT></FONT></BODY></HTML>
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