[Boatanchors] E.F Johnson calibrator 250-28 tube?

[EP Swynar]

Hi Bruce,

I'll jump in & wager it's a 6AU6...

That was a pretty common crystal oscillator / calibrator tube, "...back in
the day."

~73~ Eddy VE3CUI - VE3XZ


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----- Original Message ----- 
From: "Bruce Ussery" <twc9198764412 at earthlink.net>
To: <boatanchors at mailman.qth.net>
Sent: Saturday, November 10, 2007 8:37 PM
Subject: [Boatanchors] E.F Johnson calibrator 250-28 tube?


> I recently brought an HQ-140-XA back to life. The more I play with it the
more I like it's smooth, accurate tuning and good audio. A previous owner
added a 100 kc crystal calibrator (and did a neat job), but it's not the
XC-100 model that is mentioned in the manual. It's an E. F. Johnson 250-28
which looks pretty similar. It's working OK, but the tube number is scraped
off. If it croaks (probably not in my lifetime), I don't know what to
replace it with. My usual searches revealed to details of this unit, only
that it exists is other hams shacks. So-- does anyone have one or know what
the tube is? I promise to add a nice label for the next owner.
>
> Bruce
> WA4ZLK
> _______________________________________________