Re: [TenTec] Titan tuning drift on 160 meters

[Ken Brown <ken.d.brown@verizon.net>]

Thanks Stuart,

I know that doorknob capacitors are the way to go for HV RF and high 
current RF too. My problem is that I live on an island out in the middle 
of the Pacific Ocean, and here the best (maybe only) source of 
electronic parts is Radio Schlock. I'm pretty sure they don't stock 
doorknob caps. So since I have been unable to find my own stock of 
doorknob caps (except for the giant ones that are nearly as big as the 
tubes in the Titan) I am probably going to have to mail order some. 
Since the list of suspects totals seven capacitors, it will be an 
unneccessary expense to replace all seven of them if only one or two 
need replacing.

Ken, N6KB/KH6

Stuart Rohre wrote:

> In general, disc capacitors which are placed under extremes of voltage or
> power can have heating issues, leading to change of capacitance as the cap
> heats up and cools alternately.  They are also piezoelectric in character,
> and at enough power in the audio range have been found to have a transducer
> output of a audible tone.
>
> Doorknob caps are better suited to high current applications from reports
> observed over the years, and application in other high power amplifiers.
> 73,
> Stuart
> K5KVH
>
>
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