[Hallicrafters] HT33B HV transformer problem

[Greg Mijal]

The secondary should read 100 - 130 ohms.  The primary is going to be in the 
couple of ohms range and needs a good low ohms meter to read it correctly.
Greg
WA7LYO
in sunny Feenix
----- Original Message ----- 
From: "Greg Mijal" <bluebirdtele at earthlink.net>
To: "bill riches" <bill.riches at verizon.net>; "'Grant, Ken'" 
<Ken.Grant at uhn.on.ca>; <hallicrafters at mailman.qth.net>
Sent: Sunday, January 14, 2007 10:20 AM
Subject: Re: [Hallicrafters] HT33B HV transformer problem


> 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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>
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