K2 100 watt power amp fail and fix

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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


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Re: [Bulk] K2 100 watt power amp fail and fix

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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