[Boatanchors] ongoing Johnson adventure

[Radio AI2Q]

I use a 500V at 1A MOSFET in my Viking Valiant. Works a treat. Very low 
R(ds)ON.

Vy 73, AI2Q, Alex
Member: ARRL, FOC, RSGB, QRP-L, Antique Wireless Association, New England 
Radio Discussion Society, DXCC Honor Roll, 16ØM DXCC, 8ØM DXCC
http://ai2q.org



----- Original Message ----- 
From: "Robert Nickels" <ranickel at comcast.net>
To: <boatanchors at mailman.qth.net>
Sent: Saturday, February 11, 2017 12:01 AM
Subject: Re: [Boatanchors] ongoing Johnson adventure


> On 2/10/2017 9:33 PM, Bill Cromwell wrote:
>>  4 watt pot that (may have) failed after only 57 years or so!
>
> Hi Bill,
>
> The drive pots are a common failure item on many transmitters, including 
> the Johnson Ranger and Valiant and the DX-100.  A simple fix is to 
> substitute a regular pot and a power transistor, as described here, among 
> other places:
>
> http://www.amwindow.org/tech/htm/drivepot.htm
>
> 73, Bob W9RAN
>
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