[Elecraft] K3 Audio I/O Daughter Board

[Don Wilhelm]

  Gary,

Elecraft does not recommend any fixatives on toroids in any of its kits, 
and I also strongly discourage its use.
Many fixatives will alter the inductance, and change other 
characteristics.  Additionally, toroids mounted with fixatives make 
repairs more difficult (if a toroid must be removed) and will likely 
void the warranty.

The toroids are sturdy enough to stand normal abuse in portable/mobile 
situations as well as during transport and shipping.
As testimony to that fact, consider that one K2 I built traveled several 
million miles over the US in the cab of an 18 wheeler.  No fixatives 
were used and no toroid failures ever occurred - and I worked on that 
same K2 (for another problem) only about 3 weeks ago.

73,
Don W3FPR

On 9/26/2010 12:45 PM, Gary wrote:
> Elecraft must be having a good sales month if Roger bought his K3 (s/n 46xx)
> earlier this month and I just bought mine at last weekend's ARRL
> Southwestern Div Convention (s/n 47xx) and the month even isn't over yet.
> Congratulations Eric&  staff. I am just starting my assembly and will look
> for this audio board issue. I'd also like to see everything well supported
> inside because I plan to transport my K3 from time to time and don't want
> any intermittent problems. The first I found was the toroids in my KAT3 came
> bent over, especially L8. When I carefully straightened all of them I
> noticed L8 had to be lifted more than 1/8" above the others to snug up the
> last wraps of wire on it. Dale Farmer indicated that this is nothing to be
> concerned about however I'd be more comfortable if the toroids were
> supported more. Maybe a dab of silicone sealant below each? Any suggestions?
> Gary
>