[Elecraft] PA Transistors Maintenance in K2

[Ross Primrose]

K2s are not factory assembled.

73, Ross N4RP

On 10/28/2017 03:24 PM, Mel Farrer via Elecraft wrote:
> Ted,
>   If the people at Elecraft have done their job and mounted the transistor properly with the correct torque on the mounting hardware procedure, no additional maintainance is required. I have been in the industry for a LONG time .  Three things to remember in the mounting of any RF or high power device.  Flat surfaces, minimual mating gu, and required torque. Lack of any of these will kill a device if not correct.  I have never required retorqueing parts, with one exception.   In 000 copper wire terminals, the copper does relax and needs to be retorqued to achieve a gas tight seal connection, but that is in industrial application.  Small RF devices only need the initial torque to be correct.
>
> Mel, K6KBE
>
>        From: Cameron Francey <cameronfranceyutils at hotmail.com>
>   To: "Dauer, Edward" <edauer at law.du.edu>; "elecraft at mailman.qth.net" <elecraft at mailman.qth.net>
>   Sent: Saturday, October 28, 2017 12:10 PM
>   Subject: Re: [Elecraft] PA Transistors Maintenance in K2
>     
> A nice tip which I use when looking for anything in any sort of .pdf manual, Elecraft included as I have accumulated quite a number of them over time is to use the search feature on the .pdf reader.  Ctrl+f on WIndows and cmd+f on Mac and type what I'm looking for.  The index and contents tables are good, but obviously can't have everything in them, so I use the find feature a lot.
>
>
> Hope this helps.
>
>
> Regards, Cameron - AF7DK/GM7LQR
>
>
> ________________________________
> From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> on behalf of Dauer, Edward <edauer at law.du.edu>
> Sent: Friday, October 27, 2017 8:15 PM
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] PA Transistors Maintenance in K2
>
> I vaguely remember reading somewhere that after some number of hours of operation – maybe 50 – the hardware holding Q7 and Q8 onto the heat sink should be tightened, I presume to maintain good heat conduction from the tabs to the sink.  But I can’t find that instruction in the manual now.  Anyone know where I might have gotten that notion, or did I just make it up?
>
> Thanks,
>
> Ted, KN1CBR
>
>
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