[Collins] FW: RE KWM2A

[Tony Sokol]

Frank,
    6U8's are very prone to grid to cathode shorts.  In fact, many times 
the short will not show up on a tester so replacing the tube will be the 
only sure way to find the culprit.  It is my understanding that the 
6EA8's are not prone to this fault.  Oh, and the only place where the 
6EA8 doesn't work well is in the audio oscillator circuit in the KWM-2 
and 32S-1.  In this instance you are stuck using the 6U8. 

       73
Tony - W9JXN



Frank Woolfe wrote:
>  
>
> Can anyone shed some light on the reason of changing V13 (1st RX Mixer/Xtal
> Osc) in the KWM2A from a 6U8A to a 6EA8?
>
>  
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> Does the 6EA8 have better performance lower noise etc; and when was the
> change implemented. It appears that there is no physical difference between
> the two tubes or in circuit, so all I can surmise is that it is a
> performance issue.
>
>  
>
> Frank VK5MFW
>
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