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![]() "Renan Cysneiros" wrote in message ... Richard Knoppow;791819 Wrote: "Renan Cysneiros" wrote in message ...- Richard Knoppow;791746 Wrote:- "Hank" wrote in message ...- In article , Richard Knoppow wrote:- "Clutter" wrote in message ...- On 05/19/2012 12:08 PM, Richard Knoppow wrote: "Renan wrote in message ... 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 Thanks Renan, I don't remember who made the transformer in my 190A. I will have a look and see about getting into it. It gets hot enough to melt the potting material. The transformer in my 260A Q-Meter is cool to the touch even after its been running for an extended time which makes me thing this one should be the same. -- -- Richard Knoppow Los Angeles WB6KBL |
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