----- Original Message -----
From: "Eugene Balinski" <[email protected]>
To: <[email protected]>
Sent: Saturday, February 02, 2013 3:29 PM
Subject: [Drakelist] AC4R Rebuild Question
All,
Just finished the AC-4 rebuild kit from the Heathkit
Shop.
I measured the voltages when I finished and obtained
655, 266 (should be 290?), and -70. Is this typical for
unloaded voltages or did I mis-wire something ?
Thanks,
Gene K1NR
I made some notes after my Heathkit Shop AC-4 rebuild
and have checked them against a second AC-4 with the kit
installed.
Speced voltage at orange wire = 650 to 750 VDC; measured
685 V (another note says 694V)
Yellow wire spec "at least 290V, measured 277 and 280V I no
longer remember why I got two different voltages but they
may have been line voltage variations
Also noted, HV = 677V with transmitter connected but not
tuned up. Low voltage 250 to 260 V connected.
These were measured with a 10 megohm input electronic
voltmeter.
I have these supplies on a T4-XB and a TR-4 both of
which put out rated power. The high voltage drops quite a
bit when they are drawing full rated current, no more than
about 650V. I did not note the ripple level but at full
current my memory is that its fairly substantial but I don't
remember exactly how much.
--
Richard Knoppow
Los Angeles
WB6KBL
[email protected]
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