2 May
2005
2 May
'05
8:22 p.m.
Subject: CV Transformer - Capacitor on separate winding ?
From: Dave Dunfield <dave04a at dunfield.com>
Date: Mon, 02 May 2005 21:34:21 -0400
To: cctalk at classiccmp.org
Disconnecting this capacitor "cures" the excess current draw and
the chassis voltages come up fine (still running through variac at
reduced AC voltage with series light bulb as I expect this cap is
part of a "line voltage regulator".
The transformer is labled "C.V." (Constant Voltage?)
The cap needs to be there. An unloaded CVT runs hot and draws
more current due to the highly reactive load. A side effect
of storing power in a resonant circuit (floating coil and cap).
As the transformer is loaded the current remains the same but
more stored energy is transfered to the active load. I have
a Compupro Chassis, TEI and even a spare supply of that style.
I also have 120V/120V CVT for systems that do not have one
internally. They tend to run warm under normal cases. It
should with a modest load (auto headlamps are handy for this)
behave and also not blow primary side fuse(s).
By current switchmode tech they are scary but represent old
magamp thinking and are reliable devices.
Allison