[Amps] TL-922A - Loud Pop, Blown Fuses

[R.Measures]

On Dec 4, 2004, at 12:05 PM, Clay Curtiss W7CE wrote:

> Yesterday morning when I turned on my TL-922A, there was a very loud 
> pop
> followed by blown fuses.  I replaced the fuses, changed the setting to 
> CW to
> reduce the B+ voltage and tried again.  Similar result with several 
> smaller
> pops and then blown fuses.  I use a footswitch for T/R control and it 
> wasn't
> depressed nor was I transmitting with the exciter when I powered up.  I
> should also mention that I've heard a pop on power up two times 
> previously,
> but neither time caused a blown fuse.  I opened it up today for a 
> visual
> inspection and see no signs of arcing or anything unusual.
>
> Before I dig into this thing, has anyone else experienced this problem?

Many have, Clay.  Step 1:   To find out if there is any damage to the 
anode supply, remove the tubes, see if it still blows fuses, and, if 
not, measure the anode potential.
>
> Any hints or suggestions to reduce the troubleshooting time will be 
> appreciated.
>
> Thanks and 73,
> Clay  W7CE
>
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>

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org



Richard L. Measures, AG6K, 805.386.3734.  www.somis.org