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Renan Cysneiros · June 12th 12, 06:18 AM

Quote:

Originally Posted by Richard Knoppow

"Renan Cysneiros"
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...

Richard Knoppow;791746 Wrote:
"Hank" wrote in message
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In article
,
Richard Knoppow wrote:-

"Clutter" wrote in message
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On 05/19/2012 12:08 PM, Richard Knoppow wrote:
"Renan

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Hi everyone, I am looking for a VR-300 ,( 95 - 130
volts,
60Hz Voltage
Stibilizer ) used In BOONTON Q Meter 190A. Please, If
available, let me
know the value. Thank you in advance!

I would like to thank all ones that added valuable
informations
concerning to these wonders of electronics, developed in a
part of time
where art merges with the knowledge.
With respect to the voltage stabilizer used in 190A, q
meter, which
I cited earlier in this topic, I decided to open it, it
was not
difficult as it sounds! wrapped in a black sealant (
asphalt derived) I
found a transformer with reactor coupled to it and a large
oil capacitor
(1.75 Uf / 660 vac, Aerovox) the capacitor was swollen and
in short
circuit , as was expected because age. I replaced it by 4x
470uF /
630volts, polyester metallized,When I turned on the
electric supply
114volts 60Hertz , the output was 127 volts, I have found
information
about this type of transformer in the excellent book
(Transforming and
Inductor Design Handbook by Colonel Wm. T. McLyman)
recalculated the
capacitor based on the measured voltages, found 1.58 Uf,
then removed
one , leaving a capacitor of approximately 1.41Uf ( 3x 470
Uf ), the
output is now 116 volts.
The Q meter is running ok , I hope to get a standard coil
to check
it.

Renan
PP7HP
Maceió - AL , Brazil

Who made the transformer in your 190? I have a 190
where the transformer runs hot. It may be that the cap is
getting leaky. It still regulates at the right voltage but
is very hot.

--
Richard Knoppow
Los Angeles
WB6KBL

--
Renan Cysneiros

Dear Richard,
My transformer was manufactured by ACME electronic. Usually this type of transformer, works hot due to saturated core,” but not super hot”.
As you reported, I suspect that the cap. is leaking, it's worth a look, even due to aging. I recommend use of capacitors in parallel, at least 3 for splitting the current (1Kvolt rated), 3 x 470nF, works fine in mine.
I got my 190A via ebay in hong kong two months ago, and after about 20 min. turned on, the pilot lamp extinguished and the equipment comes down.
Now, its ok.

Greetings !

Renan – PP7HP
Maceió , Brazil