What the heck is this tube

[Mike Silva]

It's a very hot (gm = 16,500) RF pentode, according to
http://hereford.ampr.org/cgi-bin/tube

73,
Mike, KK6GM

>Hi Gang,
>
>I ran into a pile of 6688 tubes a couple of weeks ago.  It's not in any
>of my references, so what is it?  It is a 7 or 9 pin min.
>
>73
>
>Paul WA6OKQ
>
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