|[AMRadio] 6U8 Subststute?|
km1h at jeremy.mv.com
Sat Nov 10 15:20:17 EST 2007
The 6U8 was not reliable and was replaced by the 6U8A.
The 6EA8/6GH8 came along as having better performance in VHF TV tuners and
FM radios. They can be substituted for the 6U8/6U8A in most circuits but not
always. I believe Collins S Line receivers are problematic in one socket;
not sure where.
If the 20A is running them too hot then I'd check out the circuit for
something causing excessive current drain. I used a 20A decades ago and
never had that problem.
----- 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 2:20 PM
Subject: [AMRadio] 6U8 Subststute?
> ----- Original Message ----
> From: Ellen Rugowski <ellenjoanne2003 at sbcglobal.net>
> Nope, not yet Steve. Fred, KC1XF, is sending me a 6EA8 in the mail
> just gathering dust for him), and it hasn't arrived yet. It's a direct
> substitute for the 6U8, and others who voiced the same opinion as you -
> the 6U8 is kind of wimpy, and the 6EA8 will be a better driver.
> it'll arrive in today's mail (Fred sent it out on Tuesday of
> Ellen - AF9J
> Reply By Jim, WD5JKO:
> 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.
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