[Collins] FW: RE KWM2A

[Glen Zook]

The 6EA8 generally lasts considerably longer than the
6U8 and, for all practical purposes, is a "drop in"
replacement.  The only place that I have heard there
are problems is when the 6U8 is replaced with a 6EA8
is in the tone oscillator in the KWM-2 series and
32S-1/32S-2.

I believe that the 6EA8 usually has less noise than
the 6U8.  I do know that in various tube type VHF
converters (i.e. the CB-6 and CB-2 made by Ameco) that
using the 6EA8 instead of the 6U8 slightly improves
the sensitivity and reduces the background noise.

Glen, K9STH


--- Frank Woolfe <frankwoolfe at optusnet.com.au> 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?

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.









Glen, K9STH

Website:  http://k9sth.com


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