[AMRadio] 6U8 Subststute?

Ellen Rugowski ellenjoanne2003 at sbcglobal.net
Sat Nov 10 18:10:47 EST 2007


Thanks for the info Jim.  Is it a direct substitute for the 6U8?  Actually
the rig I have that uses a 6U8, is a WRL Scout 680.

Ellen - AF9J

----- Original Message ----- 
From: "Jim Candela" <jcandela at prodigy.net>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Saturday, November 10, 2007 1:20 PM
Subject: [AMRadio] 6U8 Subststute?

> Reply By Jim, WD5JKO:
>   Ellen,
>    The Central Electronics 20A uses a 6U8 also and these run pretty hot.
The tube lifetime is not very long. I have searched far and wide for a more
beefy substitute that shares the same base diagram. The 6EA8 or 6GH8 do not
have any advantages over the 6U8 that I can see. I finally bumped into the
6MU8. These have similar ratings except the pentode Pd is 3.8 watts whereas
the 6U8 pentode Pd is 2.75 watts. The main difference besides that is the
6MU8 has a taller glass envelope. The last I looked, www.tubesandmore.com
had the 6MU8 NOS for $2.75 each.
> Regards,
> Jim
> http://tubedata.tigahost.com/tubedata/sheets/049/6/6MU8.pdf
> http://tubedata.tigahost.com/tubedata/sheets/020/6/6U8.pdf
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