[Milsurplus] INFO/EXPLANATION

[J. Forster]

Read what I said:

... a load of 0.3 A....  that's much more than a bleeder would draw.
... a big filter cap so ripple is essentially negligable.

-John

==========

> Yeah, but with 3B28s you don't necessarily use a capacitor input filter,
> and even if you do you might use a bleeder resistor to hold down the
> output voltage.  This sort of thing used to be discussed in the ARRL
> Handbook, maybe it still is.
>
> On Mon, 11 May 2009, J. Forster wrote:
>
>> You can get a rough idea, if you know the type of rectifiers it was
>> designed to go with. The rectifier drop complicates matters.
>>
>> Assuming they were solid state diodes with essentially zero forward drop
>> and that it was used w/ a capacitor input filter of large enough value
>> that the ripple was small at 0.3 A DC, the 920 V is essentially the
>> peak,
>> so the RMS AC would be 920 / 1.414 = 650 V RMS....  Ground to either
>> leg.
>>
>> -John
>>
>> ========
>>
>>
>>> G'Day all.....
>>> Transformer ratings... A HV xfmr (Chicago  STC) is marked- not with AC
>>> each
>>> side of CT- but as follows : 920V DC @ 0.3 A and 904V DC @ 0.5 A.
>>> It did operate into a pair of 3B28 tubes via the one winding which was
>>> centre tapped.
>>> Q.....Is there any way of determining/relating secondary AC voltage
>>> apart
>>> from measuring using the ratings as listed.
>>> The schematic shows that a DC voltage of over 1kV appears to be used
>>> when
>>> tx
>>> operating.
>>> I confess ignorance on this rating description -obviously- but it helps
>>> me
>>> and  the customer know  what he's getting.
>>> Tks
>>> Pete VK3IZ
>>>
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>>
>>
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>
>