[Hammarlund] Hammarlund HQ110A Selectivity control failure

[Kenneth G. Gordon]

Hi, Howie:

On 14 Feb 2018 at 17:05, Howie WA3MCK wrote:

> The on/off section of my selectivity control failed on my HQ110A
> 
> It´s R12 on the schematic  - 10K with tandem switch S1.
> Part # K15378-4
> 
> Easy enough to replace or buy online but I need to know if this a linear or
> log pot.

That is a standard linear pot. The selectivity control is simply a "Q-multiplier" feedback pot. 
A log pot there would make it somewhat weird to use, IMHO.

BTW, I have an HQ-110C here to which I am doing some modifications mainly for the fun of 
it. I'm adding a mechanical filter, a better AGC, a real product detector, and a few other 
tweaks.

vy 73,
 
Ken W7EKB

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