[Amps] transformer identification

[Jim W7RY]

Steve
Send me a copy direct (jimw7ry at gmail.com) so I can post on amps at groups.io

73, Jim W7RY





On 11/15/2022 6:13 PM, Steve Bookout wrote:
> Thanks for your input, Rob.
>
> FYI, the picture was not taken with an audience in mind.  I just took 
> it so I could remember the part number.
>
> I think the AC input terminals were all mounted on a fiberglass 
> terminal strip.
>
> It is at a different location than where I'm currently.  I plan on 
> being where the transformers location tomorrow.  I'll take some more 
> pics, with some reference for scale.  I'll send them to anyone that 
> would like to see them.  The pic I took yesterday, just about choked 
> the reflector, so I won't post them here.
>
> Steve, NR4M
>
> On 11/15/2022 2:49 PM, Rob Atkinson wrote:
>> You have a transformer that appears to be on the small side but it's
>> hard to tell with nothing in the photo like a ruler to scale against.
>> The primary appears to be 1-4 which are not lugs but simply leads
>> coming out from the coil.   What I think is the secondary has two
>> solder posts, no CT so it is intended to be used with a FWB rectifier.
>> There's no lug insulation for h.v. so I suspect this is a low voltage
>> (< 1 KV) transformer.  It's odd to me that there's no center tap on
>> the secondary, but that could be a 115 v. primary.  However the lower
>> number leads are usually the primary windings.  This may be confusing
>> but I can't do more from a distance.  I'd use a VOM to measure the
>> coil resistance between the leads and see if a pair of the four
>> (probably 2 and 3) have no resistance between them.  Those two will be
>> the primary center tap.  Now you know the others are 1 and 4 and you
>> can put 20 or 30 v. AC across them and measure your v. on 5 and 6.
>> Start out with a meter like a VTVM set on 1.5 KV and come down as
>> necessary.  put everything on an insulated surface and keep all clip
>> leads and probe wires safely apart from each other and metal. set
>> everything up first before energizing the circuit so you can apply AC
>> and take a meter reading without touching anything.  Shut off AC and
>> change the meter scale and repeat until you get enough meter
>> deflection to take a measurement.    Remember that most DMMs max out
>> at 600 v. AC so using one can be risky to the meter.
>>
>> 73
>>
>> Rob
>> K5UJ
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-- 
Thanks and 73, Jim W7RY