[Hallicrafters] HT33B HV transformer problem

[Greg Mijal]

The high voltage winding should be in the 100 - 130 ohm range with a DMM. 
The number should be good for just about any 2kvac 20 - 25 pounder.
Suggest you use a light bulb in series with the primary and a variac if you 
suspect a problem.  The bulb will normally glow faintly.  If the transformer 
is shorted out or semi-shorted  the bulb will light up the room.
Greg
WA7LYO
in sunny Feenix
----- Original Message ----- 
From: "bill riches" <bill.riches at verizon.net>
To: "'Grant, Ken'" <Ken.Grant at uhn.on.ca>; <hallicrafters at mailman.qth.net>
Sent: Sunday, January 14, 2007 9:08 AM
Subject: RE: [Hallicrafters] HT33B HV transformer problem


> Resistance checking will not tell you much - a better way to check for a
> shorted turn in a power transformer is as follows:
>
> Remove all loads from secondary.
> Put a 60 watt light bulb in series with a power cord that you will plug
> into 120 vac.  The idea is to limit current for this test.  You know you
> have this hi-tech piece of test equipment working correctly if the bulb
> lights up when you short the two wires together!  Connect these two
> wires to the primary of your transformer under test.  If the bulb lights
> brightly you have a shorted primary.  With a good transformer WITH NO
> LOADS CONNECTED TO SECONDARY the bulb should not glow or may glow very
> dimly. IF YOU DO NOT KNOW WHAT YOU ARE DOING AND DO NOT HAVE ANY
> EXPERIENCE WITH TUBED GEAR AND THE HIGH VOLTAGES USED, PLEASE GET HELP
> FROM SOMEONE THAT DOES.  YOU CAN BE KILLED IF YOU DO NOT KNOW WHAT YOU
> ARE DOING.
>
> 73,
>
> Bill Riches, WA2DVU
> Cape May, NJ
>
> Subject: [Hallicrafters] HT33B HV transformer problem
>
> Hi guys. My buddy has an HT33B. We suspect that there is a short in the
> HV
> transformer primary winding. Is anybody in a position to measure the DC
> resistance of a known-to-be-good transformer primary? That would help us
> confirm our suspicions. Thanks very much for any help.
>
> Ken Grant, VE3FIT.
> ve3fit at rac.ca.
>
>
>
>
>
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