K2 100 watt power amp fail and fix

[paulb]

Hi folks

thanks to historic user postings regarding the KPA100 amp
loosing power control

D17 shorted.

Havn't got spares on hand so replaced D16 and D17 with
stock 1N4148 which have a higher forward turn on voltage.

Output checks seem ok and RF indication on the K2 looks
normal.

cheers

Paul
zl1ajy

[Bill Coleman-2]

On Oct 2, 2014, at 12:52 AM, paulb <[hidden email]> wrote:

> Hi folks
>
> thanks to historic user postings regarding the KPA100 amp
> loosing power control
>
> D17 shorted.
>
> Havn't got spares on hand so replaced D16 and D17 with
> stock 1N4148 which have a higher forward turn on voltage.
>
> Output checks seem ok and RF indication on the K2 looks
> normal.

I’ve had these diodes fail twice on my in my K2/100, so I’ve replaced them with machine-pin socket pins, so I don’t have to unsolder anything to replace them.

I wrote it up on my blog, here:
http://boringhamradiopart.blogspot.com/2014/04/fixing-k2100-again.html


Bill Coleman, AA4LR, PP-ASEL        Mail: [hidden email]
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
           -- Wilbur Wright, 1901

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