Re: {Collins} KWM-2A blows fuses upon power up



Be very cautious using a cheap DVM when measuring voltages on a 516F2 PS - insulation on probes may not be up to quality you need for the voltages (1400 plus) that can be present

Sent from my iPhone

On Feb 7, 2012, at 10:01 AM, Glen Zook <gzook@xxxxxxxxx> wrote:

> Harbor Freight has some little DVMs that do a pretty good job.  Those go on sale all the time at prices as low as $1.99 to $3.99.  Their accuracy is pretty close to my Fluke DVM.  I have several of them and keep them in various places like the glove compartment of my car.  If one gets broken, there would be no real monentary loss.  However, so far, all of mine are still working.
>  
> Glen, K9STH Website:  http://k9sth.com
> 
> 
> ________________________________
> From: Richard Knoppow <dickburk@xxxxxxxxxxxxx>
> To: W4FID - John Wiley <W4FID@xxxxxxxxxx>; CCA e-mail list <collins@xxxxxxxxxxxxx> 
> Sent: Monday, February 6, 2012 10:29 PM
> Subject: Re: {Collins} KWM-2A blows fuses upon power up
> 
> 
>    Not having any instruments or tools makes it very difficult. I suggest at least finding a multi-meter at a Radio Shack. They are not expensive and will allow you to do simple tests like measuring the resistance at tube sockets to see if they are the same as in the charts in the handbook. A simple ohmmeter can also find shorted capacitors and diodes although you may have to lift one lead. A small soldering iron would also be useful, again a suitable one is available at Radio Shack for not very much. You can do about as much power supply trouble shooting with a cheap VOM and a few tools as with much more elaborate equipment.
>    If the rectifier is a vacuum tube take it out of the socket and bring up the voltage slowly. If the main fuse blows or if the transformer growls at lower voltage its an indication that there is a short somewhere else, perhaps the transformer.
> 
> 
> --
> Richard Knoppow
> Los Angeles
> WB6KBL
> dickburk@xxxxxxxxxxxxx
> 
> 
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